66525737657 has 4 divisors (see below), whose sum is σ = 66595987536. Its totient is φ = 66455487780.

The previous prime is 66525737627. The next prime is 66525737683. The reversal of 66525737657 is 75673752566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66525737657 - 2²⁰ = 66524689081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66525737596 and 66525737605.

It is not an unprimeable number, because it can be changed into a prime (66525737627) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35123519 + ... + 35125412.

It is an arithmetic number, because the mean of its divisors is an integer number (16648996884).

Almost surely, 2^66525737657 is an apocalyptic number.

It is an amenable number.

66525737657 is a deficient number, since it is larger than the sum of its proper divisors (70249879).

66525737657 is an equidigital number, since it uses as much as digits as its factorization.

66525737657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70249878.

The product of its digits is 55566000, while the sum is 59.

The spelling of 66525737657 in words is "sixty-six billion, five hundred twenty-five million, seven hundred thirty-seven thousand, six hundred fifty-seven".