56661996368 has 10 divisors (see below), whose sum is σ = 109782617994. Its totient is φ = 28330998176.

The previous prime is 56661996343. The next prime is 56661996373. The reversal of 56661996368 is 86369916665.

It can be written as a sum of positive squares in only one way, i.e., 29366991424 + 27295004944 = 171368^2 + 165212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1770687371 + ... + 1770687402.

Almost surely, 2^56661996368 is an apocalyptic number.

It is an amenable number.

56661996368 is a deficient number, since it is larger than the sum of its proper divisors (53120621626).

56661996368 is a wasteful number, since it uses less digits than its factorization.

56661996368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541374781 (or 3541374775 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 65.

The spelling of 56661996368 in words is "fifty-six billion, six hundred sixty-one million, nine hundred ninety-six thousand, three hundred sixty-eight".