15645274964 has 24 divisors (see below), whose sum is σ = 31625209728. Its totient is φ = 6693165440.

The previous prime is 15645274963. The next prime is 15645274969. The reversal of 15645274964 is 46947254651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15645274963) 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, 10457324 + ... + 10458819.

It is an arithmetic number, because the mean of its divisors is an integer number (1317717072).

Almost surely, 2^15645274964 is an apocalyptic number.

It is an amenable number.

15645274964 is an abundant number, since it is smaller than the sum of its proper divisors (15979934764).

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

15645274964 is a wasteful number, since it uses less digits than its factorization.

15645274964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20916175 (or 20916173 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 53.

The spelling of 15645274964 in words is "fifteen billion, six hundred forty-five million, two hundred seventy-four thousand, nine hundred sixty-four".