13215257544 has 64 divisors (see below), whose sum is σ = 34756776000. Its totient is φ = 4181085440.

The previous prime is 13215257543. The next prime is 13215257557. The reversal of 13215257544 is 44575251231.

It is not an unprimeable number, because it can be changed into a prime (13215257543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119847 + ... + 201974.

It is an arithmetic number, because the mean of its divisors is an integer number (543074625).

Almost surely, 2^13215257544 is an apocalyptic number.

It is an amenable number.

13215257544 is an abundant number, since it is smaller than the sum of its proper divisors (21541518456).

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

13215257544 is a wasteful number, since it uses less digits than its factorization.

13215257544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321918 (or 321914 counting only the distinct ones).

The product of its digits is 168000, while the sum is 39.

The spelling of 13215257544 in words is "thirteen billion, two hundred fifteen million, two hundred fifty-seven thousand, five hundred forty-four".