15645564264 has 128 divisors (see below), whose sum is σ = 44508528000. Its totient is φ = 4577323520.

The previous prime is 15645564247. The next prime is 15645564301. The reversal of 15645564264 is 46246554651.

It is a happy number.

It is a super-2 number, since 2×15645564264² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 917932 + ... + 934820.

It is an arithmetic number, because the mean of its divisors is an integer number (347722875).

Almost surely, 2^15645564264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15645564264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22254264000).

15645564264 is an abundant number, since it is smaller than the sum of its proper divisors (28862963736).

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

15645564264 is a wasteful number, since it uses less digits than its factorization.

15645564264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16960 (or 16934 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 48.

The spelling of 15645564264 in words is "fifteen billion, six hundred forty-five million, five hundred sixty-four thousand, two hundred sixty-four".