166617398125 has 20 divisors (see below), whose sum is σ = 208397491456. Its totient is φ = 133170750000.

The previous prime is 166617398119. The next prime is 166617398153. The reversal of 166617398125 is 521893716661.

It is not a de Polignac number, because 166617398125 - 2⁷ = 166617397997 is a prime.

It is a super-2 number, since 2×166617398125² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 556750 + ... + 802000.

Almost surely, 2^166617398125 is an apocalyptic number.

It is an amenable number.

166617398125 is a deficient number, since it is larger than the sum of its proper divisors (41780093331).

166617398125 is an equidigital number, since it uses as much as digits as its factorization.

166617398125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246358 (or 246343 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The spelling of 166617398125 in words is "one hundred sixty-six billion, six hundred seventeen million, three hundred ninety-eight thousand, one hundred twenty-five".