66604692577 has 32 divisors (see below), whose sum is σ = 73852644096. Its totient is φ = 59875200000.

The previous prime is 66604692571. The next prime is 66604692607. The reversal of 66604692577 is 77529640666.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66604692577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66604692571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2948827 + ... + 2971327.

It is an arithmetic number, because the mean of its divisors is an integer number (2307895128).

Almost surely, 2^66604692577 is an apocalyptic number.

It is an amenable number.

66604692577 is a deficient number, since it is larger than the sum of its proper divisors (7247951519).

66604692577 is a wasteful number, since it uses less digits than its factorization.

66604692577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22681.

The product of its (nonzero) digits is 22861440, while the sum is 58.

The spelling of 66604692577 in words is "sixty-six billion, six hundred four million, six hundred ninety-two thousand, five hundred seventy-seven".