166824649657 has 24 divisors (see below), whose sum is σ = 173015740800. Its totient is φ = 160777078848.

The previous prime is 166824649643. The next prime is 166824649687. The reversal of 166824649657 is 756946428661.

It is not a de Polignac number, because 166824649657 - 2³⁵ = 132464911289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166824649627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99954019 + ... + 99955687.

It is an arithmetic number, because the mean of its divisors is an integer number (7208989200).

Almost surely, 2^166824649657 is an apocalyptic number.

It is an amenable number.

166824649657 is a deficient number, since it is larger than the sum of its proper divisors (6191091143).

166824649657 is a wasteful number, since it uses less digits than its factorization.

166824649657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2004 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 64.

The spelling of 166824649657 in words is "one hundred sixty-six billion, eight hundred twenty-four million, six hundred forty-nine thousand, six hundred fifty-seven".