66770164531 has 6 divisors (see below), whose sum is σ = 77671415940. Its totient is φ = 57231569556.

The previous prime is 66770164523. The next prime is 66770164561. The reversal of 66770164531 is 13546107766.

It is not a de Polignac number, because 66770164531 - 2³ = 66770164523 is a prime.

It is a super-2 number, since 2×66770164531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66770164511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 681328161 + ... + 681328258.

It is an arithmetic number, because the mean of its divisors is an integer number (12945235990).

Almost surely, 2^66770164531 is an apocalyptic number.

66770164531 is a deficient number, since it is larger than the sum of its proper divisors (10901251409).

66770164531 is a wasteful number, since it uses less digits than its factorization.

66770164531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362656433 (or 1362656426 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 66770164531 in words is "sixty-six billion, seven hundred seventy million, one hundred sixty-four thousand, five hundred thirty-one".