166722931 has 2 divisors, whose sum is σ = 166722932. Its totient is φ = 166722930.

The previous prime is 166722923. The next prime is 166722937. The reversal of 166722931 is 139227661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166722931 - 2³ = 166722923 is a prime.

It is a super-2 number, since 2×166722931² = 55593071442461522, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 166722931 parts by 18260 straight cuts.

It is equal to p_9329932 and since 166722931 and 9329932 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (166722937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83361465 + 83361466.

It is an arithmetic number, because the mean of its divisors is an integer number (83361466).

Almost surely, 2^166722931 is an apocalyptic number.

166722931 is a deficient number, since it is larger than the sum of its proper divisors (1).

166722931 is an equidigital number, since it uses as much as digits as its factorization.

166722931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 166722931 is about 12912.1234117398. The cubic root of 166722931 is about 550.3831280936.

The spelling of 166722931 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, nine hundred thirty-one".