15640565264 has 20 divisors (see below), whose sum is σ = 30305838204. Its totient is φ = 7819703808.

The previous prime is 15640565261. The next prime is 15640565299. The reversal of 15640565264 is 46256504651.

It can be written as a sum of positive squares in 2 ways, for example, as 10942833664 + 4697731600 = 104608^2 + 68540^2 .

It is not an unprimeable number, because it can be changed into a prime (15640565261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260444 + ... + 314820.

Almost surely, 2^15640565264 is an apocalyptic number.

It is an amenable number.

15640565264 is a deficient number, since it is larger than the sum of its proper divisors (14665272940).

15640565264 is a wasteful number, since it uses less digits than its factorization.

15640565264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72362 (or 72356 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 15640565264 in words is "fifteen billion, six hundred forty million, five hundred sixty-five thousand, two hundred sixty-four".