5660656655991 has 4 divisors (see below), whose sum is σ = 7547542207992. Its totient is φ = 3773771103992.

The previous prime is 5660656655989. The next prime is 5660656656001. The reversal of 5660656655991 is 1995566560665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5660656655991 - 2¹ = 5660656655989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5660656655921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943442775996 + ... + 943442776001.

It is an arithmetic number, because the mean of its divisors is an integer number (1886885551998).

Almost surely, 2^{5660656655991} is an apocalyptic number.

5660656655991 is a deficient number, since it is larger than the sum of its proper divisors (1886885552001).

5660656655991 is a wasteful number, since it uses less digits than its factorization.

5660656655991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886885552000.

The product of its (nonzero) digits is 393660000, while the sum is 69.

The spelling of 5660656655991 in words is "five trillion, six hundred sixty billion, six hundred fifty-six million, six hundred fifty-five thousand, nine hundred ninety-one".