66812170 has 16 divisors (see below), whose sum is σ = 126591840. Its totient is φ = 25318224.

The previous prime is 66812167. The next prime is 66812177. The reversal of 66812170 is 7121866.

It is not an unprimeable number, because it can be changed into a prime (66812177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175632 + ... + 176011.

It is an arithmetic number, because the mean of its divisors is an integer number (7911990).

Almost surely, 2^66812170 is an apocalyptic number.

66812170 is a deficient number, since it is larger than the sum of its proper divisors (59779670).

66812170 is a wasteful number, since it uses less digits than its factorization.

66812170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351669.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 66812170 is about 8173.8711758872. The cubic root of 66812170 is about 405.7749122401.

The spelling of 66812170 in words is "sixty-six million, eight hundred twelve thousand, one hundred seventy".