166917598645 has 12 divisors (see below), whose sum is σ = 233003342124. Its totient is φ = 114457781760.

The previous prime is 166917598633. The next prime is 166917598651. The reversal of 166917598645 is 546895719661.

It can be written as a sum of positive squares in 2 ways, for example, as 85034059236 + 81883539409 = 291606^2 + 286153^2 .

It is not a de Polignac number, because 166917598645 - 2⁷ = 166917598517 is a prime.

It is a super-2 number, since 2×166917598645² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340647916 + ... + 340648405.

It is an arithmetic number, because the mean of its divisors is an integer number (19416945177).

Almost surely, 2^166917598645 is an apocalyptic number.

It is an amenable number.

166917598645 is a deficient number, since it is larger than the sum of its proper divisors (66085743479).

166917598645 is an equidigital number, since it uses as much as digits as its factorization.

166917598645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681296340 (or 681296333 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 67.

The spelling of 166917598645 in words is "one hundred sixty-six billion, nine hundred seventeen million, five hundred ninety-eight thousand, six hundred forty-five".