166625131 has 2 divisors, whose sum is σ = 166625132. Its totient is φ = 166625130.

The previous prime is 166625119. The next prime is 166625191. The reversal of 166625131 is 131526661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166625131 - 2¹⁷ = 166494059 is a prime.

It is a super-2 number, since 2×166625131² = 55527868561534322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166625093 and 166625102.

It is not a weakly prime, because it can be changed into another prime (166625191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83312565 + 83312566.

It is an arithmetic number, because the mean of its divisors is an integer number (83312566).

Almost surely, 2^166625131 is an apocalyptic number.

166625131 is a deficient number, since it is larger than the sum of its proper divisors (1).

166625131 is an equidigital number, since it uses as much as digits as its factorization.

166625131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 166625131 is about 12908.3357176671. The cubic root of 166625131 is about 550.2754884344.

The spelling of 166625131 in words is "one hundred sixty-six million, six hundred twenty-five thousand, one hundred thirty-one".