66008172 has 12 divisors (see below), whose sum is σ = 154019096. Its totient is φ = 22002720.

The previous prime is 66008153. The next prime is 66008191. The reversal of 66008172 is 27180066.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66008153) and next prime (66008191).

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2750329 + ... + 2750352.

Almost surely, 2^66008172 is an apocalyptic number.

It is an amenable number.

66008172 is an abundant number, since it is smaller than the sum of its proper divisors (88010924).

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

66008172 is a wasteful number, since it uses less digits than its factorization.

66008172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500688 (or 5500686 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 66008172 is about 8124.5413409004. The cubic root of 66008172 is about 404.1406806736.

The spelling of 66008172 in words is "sixty-six million, eight thousand, one hundred seventy-two".