66570535775 has 12 divisors (see below), whose sum is σ = 82661032272. Its totient is φ = 53183159040.

The previous prime is 66570535763. The next prime is 66570535781. The reversal of 66570535775 is 57753507566.

It is not a de Polignac number, because 66570535775 - 2²⁴ = 66553758559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66570535775.

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, 1813202 + ... + 1849551.

It is an arithmetic number, because the mean of its divisors is an integer number (6888419356).

Almost surely, 2^66570535775 is an apocalyptic number.

66570535775 is a deficient number, since it is larger than the sum of its proper divisors (16090496497).

66570535775 is a wasteful number, since it uses less digits than its factorization.

66570535775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663490 (or 3663485 counting only the distinct ones).

The product of its (nonzero) digits is 23152500, while the sum is 56.

The spelling of 66570535775 in words is "sixty-six billion, five hundred seventy million, five hundred thirty-five thousand, seven hundred seventy-five".