166628931 has 16 divisors (see below), whose sum is σ = 254091264. Its totient is φ = 95148864.

The previous prime is 166628927. The next prime is 166628947. The reversal of 166628931 is 139826661.

It is not a de Polignac number, because 166628931 - 2² = 166628927 is a prime.

It is a super-2 number, since 2×166628931² = 55530401292405522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166628731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54951 + ... + 57903.

It is an arithmetic number, because the mean of its divisors is an integer number (15880704).

Almost surely, 2^166628931 is an apocalyptic number.

166628931 is a deficient number, since it is larger than the sum of its proper divisors (87462333).

166628931 is a wasteful number, since it uses less digits than its factorization.

166628931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650.

The product of its digits is 93312, while the sum is 42.

The square root of 166628931 is about 12908.4829085373. The cubic root of 166628931 is about 550.2796715388.

The spelling of 166628931 in words is "one hundred sixty-six million, six hundred twenty-eight thousand, nine hundred thirty-one".