656439227799 has 4 divisors (see below), whose sum is σ = 875252303736. Its totient is φ = 437626151864.

The previous prime is 656439227767. The next prime is 656439227803. The reversal of 656439227799 is 997722934656.

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 656439227799 - 2⁵ = 656439227767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656439227699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109406537964 + ... + 109406537969.

It is an arithmetic number, because the mean of its divisors is an integer number (218813075934).

Almost surely, 2^656439227799 is an apocalyptic number.

656439227799 is a deficient number, since it is larger than the sum of its proper divisors (218813075937).

656439227799 is a wasteful number, since it uses less digits than its factorization.

656439227799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218813075936.

The product of its digits is 308629440, while the sum is 69.

The spelling of 656439227799 in words is "six hundred fifty-six billion, four hundred thirty-nine million, two hundred twenty-seven thousand, seven hundred ninety-nine".