66057074665 has 16 divisors (see below), whose sum is σ = 80636434560. Its totient is φ = 51949162992.

The previous prime is 66057074639. The next prime is 66057074693. The reversal of 66057074665 is 56647075066.

It is not a de Polignac number, because 66057074665 - 2¹⁷ = 66056943593 is a prime.

It is a super-2 number, since 2×66057074665² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 994732 + ... + 1059058.

It is an arithmetic number, because the mean of its divisors is an integer number (5039777160).

Almost surely, 2^66057074665 is an apocalyptic number.

It is an amenable number.

66057074665 is a deficient number, since it is larger than the sum of its proper divisors (14579359895).

66057074665 is an frugal number, since it uses more digits than its factorization.

66057074665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64509 (or 64391 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 66057074665 in words is "sixty-six billion, fifty-seven million, seventy-four thousand, six hundred sixty-five".