1608730901640 has 96 divisors (see below), whose sum is σ = 5228564402880. Its totient is φ = 428979401856.

The previous prime is 1608730901633. The next prime is 1608730901647. The reversal of 1608730901640 is 461090378061.

It is a happy number.

1608730901640 is a `hidden beast` number, since 1 + 608 + 7 + 30 + 9 + 0 + 1 + 6 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1608730901633) and next prime (1608730901647).

It is a super-2 number, since 2×1608730901640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1608730901647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12697887 + ... + 12823953.

It is an arithmetic number, because the mean of its divisors is an integer number (54464212530).

Almost surely, 2^{1608730901640} is an apocalyptic number.

1608730901640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1608730901640 is an abundant number, since it is smaller than the sum of its proper divisors (3619833501240).

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

1608730901640 is a wasteful number, since it uses less digits than its factorization.

1608730901640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161531 (or 161524 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 1608730901640 in words is "one trillion, six hundred eight billion, seven hundred thirty million, nine hundred one thousand, six hundred forty".