166836813672 has 64 divisors (see below), whose sum is σ = 442961438400. Its totient is φ = 52182789120.

The previous prime is 166836813659. The next prime is 166836813709. The reversal of 166836813672 is 276318638661.

It is a super-2 number, since 2×166836813672² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482647 + ... + 752742.

It is an arithmetic number, because the mean of its divisors is an integer number (6921272475).

Almost surely, 2^166836813672 is an apocalyptic number.

166836813672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166836813672 is an abundant number, since it is smaller than the sum of its proper divisors (276124624728).

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

166836813672 is a wasteful number, since it uses less digits than its factorization.

166836813672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235746 (or 1235742 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 57.

The spelling of 166836813672 in words is "one hundred sixty-six billion, eight hundred thirty-six million, eight hundred thirteen thousand, six hundred seventy-two".