15656261640 has 64 divisors (see below), whose sum is σ = 48114380160. Its totient is φ = 4073172480.

The previous prime is 15656261609. The next prime is 15656261641. The reversal of 15656261640 is 4616265651.

It is a junction number, because it is equal to n+sod(n) for n = 15656261592 and 15656261601.

It is not an unprimeable number, because it can be changed into a prime (15656261641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1586164 + ... + 1596003.

It is an arithmetic number, because the mean of its divisors is an integer number (751787190).

Almost surely, 2^15656261640 is an apocalyptic number.

15656261640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15656261640 is an abundant number, since it is smaller than the sum of its proper divisors (32458118520).

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

15656261640 is a wasteful number, since it uses less digits than its factorization.

15656261640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182222 (or 3182218 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 15656261640 in words is "fifteen billion, six hundred fifty-six million, two hundred sixty-one thousand, six hundred forty".