15640564051 has 8 divisors (see below), whose sum is σ = 17881123680. Its totient is φ = 13401552768.

The previous prime is 15640564031. The next prime is 15640564057. The reversal of 15640564051 is 15046504651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15640564051 - 2⁹ = 15640563539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15640564051.

It is not an unprimeable number, because it can be changed into a prime (15640564057) 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, 365356 + ... + 405913.

It is an arithmetic number, because the mean of its divisors is an integer number (2235140460).

Almost surely, 2^15640564051 is an apocalyptic number.

15640564051 is a deficient number, since it is larger than the sum of its proper divisors (2240559629).

15640564051 is an equidigital number, since it uses as much as digits as its factorization.

15640564051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774173.

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

The spelling of 15640564051 in words is "fifteen billion, six hundred forty million, five hundred sixty-four thousand, fifty-one".