166396631 has 2 divisors, whose sum is σ = 166396632. Its totient is φ = 166396630.

The previous prime is 166396553. The next prime is 166396639. The reversal of 166396631 is 136693661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166396631 is a prime.

It is a super-2 number, since 2×166396631² = 55375677616300322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166396639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83198315 + 83198316.

It is an arithmetic number, because the mean of its divisors is an integer number (83198316).

Almost surely, 2^166396631 is an apocalyptic number.

166396631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166396631 is an equidigital number, since it uses as much as digits as its factorization.

166396631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 166396631 is about 12899.4818112977. The cubic root of 166396631 is about 550.0238347798.

The spelling of 166396631 in words is "one hundred sixty-six million, three hundred ninety-six thousand, six hundred thirty-one".