56691218417 has 4 divisors (see below), whose sum is σ = 56751083376. Its totient is φ = 56631353460.

The previous prime is 56691218393. The next prime is 56691218449. The reversal of 56691218417 is 71481219665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56691218417 - 2⁸ = 56691218161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56691218497) 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, 29931059 + ... + 29932952.

It is an arithmetic number, because the mean of its divisors is an integer number (14187770844).

Almost surely, 2^56691218417 is an apocalyptic number.

It is an amenable number.

56691218417 is a deficient number, since it is larger than the sum of its proper divisors (59864959).

56691218417 is an equidigital number, since it uses as much as digits as its factorization.

56691218417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59864958.

The product of its digits is 725760, while the sum is 50.

The spelling of 56691218417 in words is "fifty-six billion, six hundred ninety-one million, two hundred eighteen thousand, four hundred seventeen".