66689769604 has 12 divisors (see below), whose sum is σ = 117019987084. Its totient is φ = 33255487584.

The previous prime is 66689769593. The next prime is 66689769631. The reversal of 66689769604 is 40696798666.

It can be written as a sum of positive squares in 2 ways, for example, as 43973251204 + 22716518400 = 209698^2 + 150720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66689769604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22347627 + ... + 22350610.

Almost surely, 2^66689769604 is an apocalyptic number.

It is an amenable number.

66689769604 is a deficient number, since it is larger than the sum of its proper divisors (50330217480).

66689769604 is a wasteful number, since it uses less digits than its factorization.

66689769604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44698614 (or 44698612 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 67.

The spelling of 66689769604 in words is "sixty-six billion, six hundred eighty-nine million, seven hundred sixty-nine thousand, six hundred four".