665106056 has 32 divisors (see below), whose sum is σ = 1284336000. Its totient is φ = 322760256.

The previous prime is 665106041. The next prime is 665106067. The reversal of 665106056 is 650601566.

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, 28370 + ... + 46206.

It is an arithmetic number, because the mean of its divisors is an integer number (40135500).

Almost surely, 2^665106056 is an apocalyptic number.

It is an amenable number.

665106056 is a deficient number, since it is larger than the sum of its proper divisors (619229944).

665106056 is a wasteful number, since it uses less digits than its factorization.

665106056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17981 (or 17977 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 665106056 is about 25789.6501721136. The cubic root of 665106056 is about 872.8982726452.

The spelling of 665106056 in words is "six hundred sixty-five million, one hundred six thousand, fifty-six".