66164715 has 32 divisors (see below), whose sum is σ = 118347840. Its totient is φ = 35071488.

The previous prime is 66164701. The next prime is 66164717. The reversal of 66164715 is 51746166.

66164715 is a `hidden beast` number, since 6 + 6 + 1 + 647 + 1 + 5 = 666.

It is not a de Polignac number, because 66164715 - 2⁴ = 66164699 is a prime.

It is a super-2 number, since 2×66164715² = 8755539022062450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66164715.

It is not an unprimeable number, because it can be changed into a prime (66164717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21939 + ... + 24771.

It is an arithmetic number, because the mean of its divisors is an integer number (3698370).

Almost surely, 2^66164715 is an apocalyptic number.

66164715 is a deficient number, since it is larger than the sum of its proper divisors (52183125).

66164715 is a wasteful number, since it uses less digits than its factorization.

66164715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020 (or 3014 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 66164715 is about 8134.1695949863. The cubic root of 66164715 is about 404.4599110844.

The spelling of 66164715 in words is "sixty-six million, one hundred sixty-four thousand, seven hundred fifteen".