16251541640 has 16 divisors (see below), whose sum is σ = 36565968780. Its totient is φ = 6500616640.

The previous prime is 16251541639. The next prime is 16251541661. The reversal of 16251541640 is 4614515261.

It can be written as a sum of positive squares in 2 ways, for example, as 14747187844 + 1504353796 = 121438^2 + 38786^2 .

It is a super-2 number, since 2×16251541640² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16251541640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203144231 + ... + 203144310.

Almost surely, 2^16251541640 is an apocalyptic number.

16251541640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16251541640 is an abundant number, since it is smaller than the sum of its proper divisors (20314427140).

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

16251541640 is a wasteful number, since it uses less digits than its factorization.

16251541640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406288552 (or 406288548 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 16251541640 in words is "sixteen billion, two hundred fifty-one million, five hundred forty-one thousand, six hundred forty".