15664551040 has 64 divisors (see below), whose sum is σ = 38244908160. Its totient is φ = 6132493312.

The previous prime is 15664551031. The next prime is 15664551047. The reversal of 15664551040 is 4015546651.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (15664551047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230302 + ... + 290461.

It is an arithmetic number, because the mean of its divisors is an integer number (597576690).

Almost surely, 2^15664551040 is an apocalyptic number.

15664551040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15664551040 is an abundant number, since it is smaller than the sum of its proper divisors (22580357120).

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

15664551040 is an equidigital number, since it uses as much as digits as its factorization.

15664551040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520829 (or 520817 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 15664551040 in words is "fifteen billion, six hundred sixty-four million, five hundred fifty-one thousand, forty".