66165372 has 144 divisors (see below), whose sum is σ = 216885760. Its totient is φ = 16516224.

The previous prime is 66165367. The next prime is 66165389. The reversal of 66165372 is 27356166.

66165372 is a `hidden beast` number, since 6 + 616 + 5 + 37 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61713 + ... + 62775.

Almost surely, 2^66165372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66165372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108442880).

66165372 is an abundant number, since it is smaller than the sum of its proper divisors (150720388).

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

66165372 is a wasteful number, since it uses less digits than its factorization.

66165372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1107 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 66165372 is about 8134.2099800780. The cubic root of 66165372 is about 404.4612498104.

The spelling of 66165372 in words is "sixty-six million, one hundred sixty-five thousand, three hundred seventy-two".