166118431 has 2 divisors, whose sum is σ = 166118432. Its totient is φ = 166118430.

The previous prime is 166118423. The next prime is 166118471. The reversal of 166118431 is 134811661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166118431 - 2³ = 166118423 is a prime.

It is a super-2 number, since 2×166118431² = 55190666235803522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166118393 and 166118402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166118471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83059215 + 83059216.

It is an arithmetic number, because the mean of its divisors is an integer number (83059216).

Almost surely, 2^166118431 is an apocalyptic number.

166118431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166118431 is an equidigital number, since it uses as much as digits as its factorization.

166118431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 166118431 is about 12888.6939214181. The cubic root of 166118431 is about 549.7171338852.

The spelling of 166118431 in words is "one hundred sixty-six million, one hundred eighteen thousand, four hundred thirty-one".