66520705175 has 6 divisors (see below), whose sum is σ = 82485674448. Its totient is φ = 53216564120.

The previous prime is 66520705171. The next prime is 66520705177. The reversal of 66520705175 is 57150702566.

It is not a de Polignac number, because 66520705175 - 2² = 66520705171 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 (66520705171) 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, 1330414079 + ... + 1330414128.

It is an arithmetic number, because the mean of its divisors is an integer number (13747612408).

Almost surely, 2^66520705175 is an apocalyptic number.

66520705175 is a deficient number, since it is larger than the sum of its proper divisors (15964969273).

66520705175 is a wasteful number, since it uses less digits than its factorization.

66520705175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660828217 (or 2660828212 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 44.

The spelling of 66520705175 in words is "sixty-six billion, five hundred twenty million, seven hundred five thousand, one hundred seventy-five".