166999966920 has 64 divisors (see below), whose sum is σ = 556666560000. Its totient is φ = 44533324224.

The previous prime is 166999966907. The next prime is 166999966933. The reversal of 166999966920 is 29669999661.

It is an interprime number because it is at equal distance from previous prime (166999966907) and next prime (166999966933).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77313720 + ... + 77315879.

It is an arithmetic number, because the mean of its divisors is an integer number (8697915000).

Almost surely, 2^166999966920 is an apocalyptic number.

166999966920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166999966920 is an abundant number, since it is smaller than the sum of its proper divisors (389666593080).

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

166999966920 is a wasteful number, since it uses less digits than its factorization.

166999966920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154629619 (or 154629609 counting only the distinct ones).

The product of its (nonzero) digits is 153055008, while the sum is 72.

The spelling of 166999966920 in words is "one hundred sixty-six billion, nine hundred ninety-nine million, nine hundred sixty-six thousand, nine hundred twenty".