15600660400 has 90 divisors (see below), whose sum is σ = 40585663140. Its totient is φ = 5760218880.

The previous prime is 15600660389. The next prime is 15600660401. The reversal of 15600660400 is 406600651.

It is a super-2 number, since 2×15600660400² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15600660401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47790 + ... + 182989.

Almost surely, 2^15600660400 is an apocalyptic number.

15600660400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15600660400 is an abundant number, since it is smaller than the sum of its proper divisors (24985002740).

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

15600660400 is a wasteful number, since it uses less digits than its factorization.

15600660400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230823 (or 230799 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 15600660400 in words is "fifteen billion, six hundred million, six hundred sixty thousand, four hundred".