666151656 has 32 divisors (see below), whose sum is σ = 1670172000. Its totient is φ = 221411520.

The previous prime is 666151649. The next prime is 666151697. The reversal of 666151656 is 656151666.

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, 31390 + ... + 48141.

It is an arithmetic number, because the mean of its divisors is an integer number (52192875).

Almost surely, 2^666151656 is an apocalyptic number.

It is an amenable number.

666151656 is an abundant number, since it is smaller than the sum of its proper divisors (1004020344).

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

666151656 is a wasteful number, since it uses less digits than its factorization.

666151656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79889 (or 79885 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 666151656 is about 25809.9139091939. The cubic root of 666151656 is about 873.3554551564.

The spelling of 666151656 in words is "six hundred sixty-six million, one hundred fifty-one thousand, six hundred fifty-six".