166964891 has 2 divisors, whose sum is σ = 166964892. Its totient is φ = 166964890.

The previous prime is 166964887. The next prime is 166964909. The reversal of 166964891 is 198469661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166964891 - 2² = 166964887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166964491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83482445 + 83482446.

It is an arithmetic number, because the mean of its divisors is an integer number (83482446).

Almost surely, 2^166964891 is an apocalyptic number.

166964891 is a deficient number, since it is larger than the sum of its proper divisors (1).

166964891 is an equidigital number, since it uses as much as digits as its factorization.

166964891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 166964891 is about 12921.4895039233. The cubic root of 166964891 is about 550.6492509170.

The spelling of 166964891 in words is "one hundred sixty-six million, nine hundred sixty-four thousand, eight hundred ninety-one".