661363504 has 10 divisors (see below), whose sum is σ = 1281391820. Its totient is φ = 330681744.

The previous prime is 661363489. The next prime is 661363519. The reversal of 661363504 is 405363166.

It is an interprime number because it is at equal distance from previous prime (661363489) and next prime (661363519).

It is a self number, because there is not a number n which added to its sum of digits gives 661363504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20667594 + ... + 20667625.

It is an arithmetic number, because the mean of its divisors is an integer number (128139182).

Almost surely, 2^661363504 is an apocalyptic number.

It is an amenable number.

661363504 is a deficient number, since it is larger than the sum of its proper divisors (620028316).

661363504 is a wasteful number, since it uses less digits than its factorization.

661363504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41335227 (or 41335221 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 661363504 is about 25716.9886261981. The cubic root of 661363504 is about 871.2579257520.

The spelling of 661363504 in words is "six hundred sixty-one million, three hundred sixty-three thousand, five hundred four".