66604878575 has 24 divisors (see below), whose sum is σ = 87156125520. Its totient is φ = 50352192000.

The previous prime is 66604878547. The next prime is 66604878577. The reversal of 66604878575 is 57587840666.

It is not a de Polignac number, because 66604878575 - 2¹⁸ = 66604616431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604878577) 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 23 ways as a sum of consecutive naturals, for example, 11975 + ... + 365175.

It is an arithmetic number, because the mean of its divisors is an integer number (3631505230).

Almost surely, 2^66604878575 is an apocalyptic number.

66604878575 is a deficient number, since it is larger than the sum of its proper divisors (20551246945).

66604878575 is a wasteful number, since it uses less digits than its factorization.

66604878575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353627 (or 353622 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 66604878575 in words is "sixty-six billion, six hundred four million, eight hundred seventy-eight thousand, five hundred seventy-five".