659971956 has 36 divisors (see below), whose sum is σ = 1760553312. Its totient is φ = 188496144.

The previous prime is 659971931. The next prime is 659971969. The reversal of 659971956 is 659179956.

It is a junction number, because it is equal to n+sod(n) for n = 659971896 and 659971905.

It is a congruent number.

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, 234051 + ... + 236853.

Almost surely, 2^659971956 is an apocalyptic number.

It is an amenable number.

659971956 is an abundant number, since it is smaller than the sum of its proper divisors (1100581356).

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

659971956 is an equidigital number, since it uses as much as digits as its factorization.

659971956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620 (or 2815 counting only the distinct ones).

The product of its digits is 4592700, while the sum is 57.

The square root of 659971956 is about 25689.9193459224. The cubic root of 659971956 is about 870.6464372485.

The spelling of 659971956 in words is "six hundred fifty-nine million, nine hundred seventy-one thousand, nine hundred fifty-six".