165666116574 has 48 divisors (see below), whose sum is σ = 410244108768. Its totient is φ = 47330493696.

The previous prime is 165666116521. The next prime is 165666116617. The reversal of 165666116574 is 475611666561.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165666116574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3592914 + ... + 3638730.

It is an arithmetic number, because the mean of its divisors is an integer number (8546752266).

Almost surely, 2^165666116574 is an apocalyptic number.

165666116574 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

165666116574 is an abundant number, since it is smaller than the sum of its proper divisors (244577992194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165666116574 is a wasteful number, since it uses less digits than its factorization.

165666116574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74529 (or 74526 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 165666116574 in words is "one hundred sixty-five billion, six hundred sixty-six million, one hundred sixteen thousand, five hundred seventy-four".