66205172 has 12 divisors (see below), whose sum is σ = 126391776. Its totient is φ = 30093240.

The previous prime is 66205169. The next prime is 66205193. The reversal of 66205172 is 27150266.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 752288 + ... + 752375.

It is an arithmetic number, because the mean of its divisors is an integer number (10532648).

Almost surely, 2^66205172 is an apocalyptic number.

It is an amenable number.

66205172 is a deficient number, since it is larger than the sum of its proper divisors (60186604).

66205172 is a wasteful number, since it uses less digits than its factorization.

66205172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504678 (or 1504676 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66205172 is about 8136.6560699098. The cubic root of 66205172 is about 404.5423311508.

The spelling of 66205172 in words is "sixty-six million, two hundred five thousand, one hundred seventy-two".