66550172 has 36 divisors (see below), whose sum is σ = 133551936. Its totient is φ = 28903680.

The previous prime is 66550163. The next prime is 66550193. The reversal of 66550172 is 27105566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8597 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (3709776).

Almost surely, 2^66550172 is an apocalyptic number.

It is an amenable number.

66550172 is an abundant number, since it is smaller than the sum of its proper divisors (67001764).

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

66550172 is a wasteful number, since it uses less digits than its factorization.

66550172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838 (or 5823 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 66550172 is about 8157.8288778326. The cubic root of 66550172 is about 405.2438139705.

The spelling of 66550172 in words is "sixty-six million, five hundred fifty thousand, one hundred seventy-two".