661315524 has 24 divisors (see below), whose sum is σ = 1544340000. Its totient is φ = 220257024.

The previous prime is 661315511. The next prime is 661315547. The reversal of 661315524 is 425513166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7074 + ... + 37049.

It is an arithmetic number, because the mean of its divisors is an integer number (64347500).

Almost surely, 2^661315524 is an apocalyptic number.

It is an amenable number.

661315524 is an abundant number, since it is smaller than the sum of its proper divisors (883024476).

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

661315524 is a wasteful number, since it uses less digits than its factorization.

661315524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45379 (or 45377 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 661315524 is about 25716.0557628887. The cubic root of 661315524 is about 871.2368561657.

The spelling of 661315524 in words is "six hundred sixty-one million, three hundred fifteen thousand, five hundred twenty-four".