665135556 has 36 divisors (see below), whose sum is σ = 1578832752. Its totient is φ = 217940336.

The previous prime is 665135543. The next prime is 665135593. The reversal of 665135556 is 655531566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33811 + ... + 49733.

Almost surely, 2^665135556 is an apocalyptic number.

It is an amenable number.

665135556 is an abundant number, since it is smaller than the sum of its proper divisors (913697196).

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

665135556 is a wasteful number, since it uses less digits than its factorization.

665135556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16048 (or 15987 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The square root of 665135556 is about 25790.2221006334. Note that the first 3 decimals coincide. The cubic root of 665135556 is about 872.9111779145.

The spelling of 665135556 in words is "six hundred sixty-five million, one hundred thirty-five thousand, five hundred fifty-six".