166651001656 has 16 divisors (see below), whose sum is σ = 323245477800. Its totient is φ = 80452207584.

The previous prime is 166651001651. The next prime is 166651001677. The reversal of 166651001656 is 656100156661.

It is a super-2 number, since 2×166651001656² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166651001651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359161410 + ... + 359161873.

Almost surely, 2^166651001656 is an apocalyptic number.

It is an amenable number.

166651001656 is a deficient number, since it is larger than the sum of its proper divisors (156594476144).

166651001656 is a wasteful number, since it uses less digits than its factorization.

166651001656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718323318 (or 718323314 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 166651001656 in words is "one hundred sixty-six billion, six hundred fifty-one million, one thousand, six hundred fifty-six".