661232056 has 16 divisors (see below), whose sum is σ = 1240696800. Its totient is φ = 330379584.

The previous prime is 661232021. The next prime is 661232071. The reversal of 661232056 is 650232166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17376 + ... + 40303.

It is an arithmetic number, because the mean of its divisors is an integer number (77543550).

Almost surely, 2^661232056 is an apocalyptic number.

It is an amenable number.

661232056 is a deficient number, since it is larger than the sum of its proper divisors (579464744).

661232056 is a wasteful number, since it uses less digits than its factorization.

661232056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59118 (or 59114 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 661232056 is about 25714.4328344998. The cubic root of 661232056 is about 871.2002002100.

The spelling of 661232056 in words is "six hundred sixty-one million, two hundred thirty-two thousand, fifty-six".