665660565175 has 6 divisors (see below), whose sum is σ = 825419100848. Its totient is φ = 532528452120.

The previous prime is 665660565151. The next prime is 665660565179. The reversal of 665660565175 is 571565066566.

It is not a de Polignac number, because 665660565175 - 2¹⁹ = 665660040887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665660565179) 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, 13313211279 + ... + 13313211328.

Almost surely, 2^665660565175 is an apocalyptic number.

665660565175 is a deficient number, since it is larger than the sum of its proper divisors (159758535673).

665660565175 is a wasteful number, since it uses less digits than its factorization.

665660565175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26626422617 (or 26626422612 counting only the distinct ones).

The product of its (nonzero) digits is 34020000, while the sum is 58.

The spelling of 665660565175 in words is "six hundred sixty-five billion, six hundred sixty million, five hundred sixty-five thousand, one hundred seventy-five".