166849999956 has 48 divisors (see below), whose sum is σ = 432986736000. Its totient is φ = 55563610176.

The previous prime is 166849999933. The next prime is 166849999957. The reversal of 166849999956 is 659999948661.

166849999956 is a `hidden beast` number, since 16 + 68 + 499 + 9 + 9 + 9 + 56 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166849999957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623080 + ... + 849663.

It is an arithmetic number, because the mean of its divisors is an integer number (9020557000).

Almost surely, 2^166849999956 is an apocalyptic number.

It is an amenable number.

166849999956 is an abundant number, since it is smaller than the sum of its proper divisors (266136736044).

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

166849999956 is a wasteful number, since it uses less digits than its factorization.

166849999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473805 (or 1473797 counting only the distinct ones).

The product of its digits is 2040733440, while the sum is 81.

The spelling of 166849999956 in words is "one hundred sixty-six billion, eight hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".