1659601944 has 192 divisors, whose sum is σ = 6035178240. Its totient is φ = 397889280.

The previous prime is 1659601919. The next prime is 1659601969. The reversal of 1659601944 is 4491069561.

It is a happy number.

1659601944 is a `hidden beast` number, since 1 + 6 + 596 + 0 + 19 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (1659601919) and next prime (1659601969).

It is a super-2 number, since 2×1659601944² = 5508557225057158272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1659601944.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60559 + ... + 83585.

It is an arithmetic number, because the mean of its divisors is an integer number (31433220).

Almost surely, 2^1659601944 is an apocalyptic number.

1659601944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659601944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3017589120).

1659601944 is an abundant number, since it is smaller than the sum of its proper divisors (4375576296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1659601944 is a wasteful number, since it uses less digits than its factorization.

1659601944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23070 (or 23063 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1659601944 is about 40738.2123319127. The cubic root of 1659601944 is about 1183.9534979149.

The spelling of 1659601944 in words is "one billion, six hundred fifty-nine million, six hundred one thousand, nine hundred forty-four".