66663773644 has 48 divisors (see below), whose sum is σ = 130664732800. Its totient is φ = 29557322496.

The previous prime is 66663773639. The next prime is 66663773669. The reversal of 66663773644 is 44637736666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67299 + ... + 371290.

Almost surely, 2^66663773644 is an apocalyptic number.

It is an amenable number.

66663773644 is a deficient number, since it is larger than the sum of its proper divisors (64000959156).

66663773644 is a wasteful number, since it uses less digits than its factorization.

66663773644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438722 (or 438720 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 58.

The spelling of 66663773644 in words is "sixty-six billion, six hundred sixty-three million, seven hundred seventy-three thousand, six hundred forty-four".