1659497868 has 120 divisors (see below), whose sum is σ = 4972906400. Its totient is φ = 472718592.

The previous prime is 1659497849. The next prime is 1659497887. The reversal of 1659497868 is 8687949561.

1659497868 is a `hidden beast` number, since 1 + 65 + 9 + 497 + 86 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1659497849) and next prime (1659497887).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 926718 + ... + 928506.

Almost surely, 2^1659497868 is an apocalyptic number.

1659497868 is a gapful number since it is divisible by the number (18) 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 1659497868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486453200).

1659497868 is an abundant number, since it is smaller than the sum of its proper divisors (3313408532).

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

1659497868 is a wasteful number, since it uses less digits than its factorization.

1659497868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2210 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 1659497868 is about 40736.9349362467. The cubic root of 1659497868 is about 1183.9287482612.

The spelling of 1659497868 in words is "one billion, six hundred fifty-nine million, four hundred ninety-seven thousand, eight hundred sixty-eight".