166926881 has 12 divisors (see below), whose sum is σ = 184899792. Its totient is φ = 150579000.

The previous prime is 166926863. The next prime is 166926883. The reversal of 166926881 is 188629661.

It is a de Polignac number, because none of the positive numbers 2^k-166926881 is a prime.

It is a super-2 number, since 2×166926881² = 55729167200776322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166926883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10586 + ... + 21116.

It is an arithmetic number, because the mean of its divisors is an integer number (15408316).

Almost surely, 2^166926881 is an apocalyptic number.

166926881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166926881 is a deficient number, since it is larger than the sum of its proper divisors (17972911).

166926881 is a wasteful number, since it uses less digits than its factorization.

166926881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684 (or 10673 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 166926881 is about 12920.0186145377. The cubic root of 166926881 is about 550.6074621586.

The spelling of 166926881 in words is "one hundred sixty-six million, nine hundred twenty-six thousand, eight hundred eighty-one".