166122231355631 has 2 divisors, whose sum is σ = 166122231355632. Its totient is φ = 166122231355630.

The previous prime is 166122231355627. The next prime is 166122231355687. The reversal of 166122231355631 is 136553132221661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166122231355631 - 2² = 166122231355627 is a prime.

It is a super-2 number, since 2×166122231355631² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166122231355331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83061115677815 + 83061115677816.

It is an arithmetic number, because the mean of its divisors is an integer number (83061115677816).

Almost surely, 2^{166122231355631} is an apocalyptic number.

166122231355631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166122231355631 is an equidigital number, since it uses as much as digits as its factorization.

166122231355631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 47.

The spelling of 166122231355631 in words is "one hundred sixty-six trillion, one hundred twenty-two billion, two hundred thirty-one million, three hundred fifty-five thousand, six hundred thirty-one".