656222387438 has 4 divisors (see below), whose sum is σ = 984333581160. Its totient is φ = 328111193718.

The previous prime is 656222387417. The next prime is 656222387497. The reversal of 656222387438 is 834783222656.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164055596858 + ... + 164055596861.

It is an arithmetic number, because the mean of its divisors is an integer number (246083395290).

Almost surely, 2^656222387438 is an apocalyptic number.

656222387438 is a deficient number, since it is larger than the sum of its proper divisors (328111193722).

656222387438 is a wasteful number, since it uses less digits than its factorization.

656222387438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328111193721.

The product of its digits is 23224320, while the sum is 56.

The spelling of 656222387438 in words is "six hundred fifty-six billion, two hundred twenty-two million, three hundred eighty-seven thousand, four hundred thirty-eight".