66668773924 has 6 divisors (see below), whose sum is σ = 116670354374. Its totient is φ = 33334386960.

The previous prime is 66668773907. The next prime is 66668773939. The reversal of 66668773924 is 42937786666.

It can be written as a sum of positive squares in only one way, i.e., 50971189824 + 15697584100 = 225768^2 + 125290^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333596737 + ... + 8333596744.

Almost surely, 2^66668773924 is an apocalyptic number.

It is an amenable number.

66668773924 is a deficient number, since it is larger than the sum of its proper divisors (50001580450).

66668773924 is a wasteful number, since it uses less digits than its factorization.

66668773924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667193485 (or 16667193483 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 64.

The spelling of 66668773924 in words is "sixty-six billion, six hundred sixty-eight million, seven hundred seventy-three thousand, nine hundred twenty-four".