56143556661 has 8 divisors (see below), whose sum is σ = 74931541920. Its totient is φ = 37392304592.

The previous prime is 56143556603. The next prime is 56143556701. The reversal of 56143556661 is 16665534165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56143556661 - 2⁶ = 56143556597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56143556661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56143556461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9179730 + ... + 9185843.

It is an arithmetic number, because the mean of its divisors is an integer number (9366442740).

Almost surely, 2^56143556661 is an apocalyptic number.

It is an amenable number.

56143556661 is a deficient number, since it is larger than the sum of its proper divisors (18787985259).

56143556661 is a wasteful number, since it uses less digits than its factorization.

56143556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366595.

The product of its digits is 1944000, while the sum is 48.

The spelling of 56143556661 in words is "fifty-six billion, one hundred forty-three million, five hundred fifty-six thousand, six hundred sixty-one".