66570665 has 48 divisors (see below), whose sum is σ = 97511040. Its totient is φ = 43464960.

The previous prime is 66570649. The next prime is 66570683. The reversal of 66570665 is 56607566.

It is not a de Polignac number, because 66570665 - 2⁴ = 66570649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 747941 + ... + 748029.

It is an arithmetic number, because the mean of its divisors is an integer number (2031480).

Almost surely, 2^66570665 is an apocalyptic number.

It is an amenable number.

66570665 is a deficient number, since it is larger than the sum of its proper divisors (30940375).

66570665 is a wasteful number, since it uses less digits than its factorization.

66570665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 66570665 is about 8159.0848138747. The cubic root of 66570665 is about 405.2854056947.

The spelling of 66570665 in words is "sixty-six million, five hundred seventy thousand, six hundred sixty-five".