166865544 has 24 divisors (see below), whose sum is σ = 451927710. Its totient is φ = 55621824.

The previous prime is 166865539. The next prime is 166865563. The reversal of 166865544 is 445568661.

166865544 is a `hidden beast` number, since 16 + 6 + 86 + 554 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 98604900 + 68260644 = 9930^2 + 8262^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 166865544.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1158717 + ... + 1158860.

Almost surely, 2^166865544 is an apocalyptic number.

It is an amenable number.

166865544 is an abundant number, since it is smaller than the sum of its proper divisors (285062166).

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

166865544 is a wasteful number, since it uses less digits than its factorization.

166865544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317589 (or 2317582 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 166865544 is about 12917.6446769525. The cubic root of 166865544 is about 550.5400139698.

The spelling of 166865544 in words is "one hundred sixty-six million, eight hundred sixty-five thousand, five hundred forty-four".