56665472791 has 4 divisors (see below), whose sum is σ = 57098033784. Its totient is φ = 56232911800.

The previous prime is 56665472771. The next prime is 56665472803. The reversal of 56665472791 is 19727456665.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56665472791 is a prime.

It is a super-2 number, since 2×56665472791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56665472701) 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, 216280300 + ... + 216280561.

It is an arithmetic number, because the mean of its divisors is an integer number (14274508446).

Almost surely, 2^56665472791 is an apocalyptic number.

56665472791 is a deficient number, since it is larger than the sum of its proper divisors (432560993).

56665472791 is a wasteful number, since it uses less digits than its factorization.

56665472791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432560992.

The product of its digits is 19051200, while the sum is 58.

The spelling of 56665472791 in words is "fifty-six billion, six hundred sixty-five million, four hundred seventy-two thousand, seven hundred ninety-one".