660599955 has 40 divisors (see below), whose sum is σ = 1187236512. Its totient is φ = 351412992.

The previous prime is 660599939. The next prime is 660600011. The reversal of 660599955 is 559995066.

It is not a de Polignac number, because 660599955 - 2⁴ = 660599939 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173482 + ... + 177248.

Almost surely, 2^660599955 is an apocalyptic number.

660599955 is a deficient number, since it is larger than the sum of its proper divisors (526636557).

660599955 is a wasteful number, since it uses less digits than its factorization.

660599955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 3280500, while the sum is 54.

The square root of 660599955 is about 25702.1391133112. The cubic root of 660599955 is about 870.9225054223.

The spelling of 660599955 in words is "six hundred sixty million, five hundred ninety-nine thousand, nine hundred fifty-five".