665162656 has 12 divisors (see below), whose sum is σ = 1309539042. Its totient is φ = 332581312.

The previous prime is 665162549. The next prime is 665162713. The reversal of 665162656 is 656261566.

It can be written as a sum of positive squares in only one way, i.e., 620807056 + 44355600 = 24916^2 + 6660^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10393135 + ... + 10393198.

Almost surely, 2^665162656 is an apocalyptic number.

It is an amenable number.

665162656 is a deficient number, since it is larger than the sum of its proper divisors (644376386).

665162656 is a wasteful number, since it uses less digits than its factorization.

665162656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20786343 (or 20786335 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 665162656 is about 25790.7474881982. The cubic root of 665162656 is about 872.9230329274.

The spelling of 665162656 in words is "six hundred sixty-five million, one hundred sixty-two thousand, six hundred fifty-six".