166125899 has 4 divisors (see below), whose sum is σ = 169989336. Its totient is φ = 162262464.

The previous prime is 166125877. The next prime is 166125913. The reversal of 166125899 is 998521661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166125899 - 2⁸ = 166125643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166125829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1931654 + ... + 1931739.

It is an arithmetic number, because the mean of its divisors is an integer number (42497334).

Almost surely, 2^166125899 is an apocalyptic number.

166125899 is a deficient number, since it is larger than the sum of its proper divisors (3863437).

166125899 is an equidigital number, since it uses as much as digits as its factorization.

166125899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863436.

The product of its digits is 233280, while the sum is 47.

The square root of 166125899 is about 12888.9836294411. The cubic root of 166125899 is about 549.7253714340.

The spelling of 166125899 in words is "one hundred sixty-six million, one hundred twenty-five thousand, eight hundred ninety-nine".