656338469 has 4 divisors (see below), whose sum is σ = 678970860. Its totient is φ = 633706080.

The previous prime is 656338447. The next prime is 656338471. The reversal of 656338469 is 964833656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 513249025 + 143089444 = 22655^2 + 11962^2 .

It is a cyclic number.

It is not a de Polignac number, because 656338469 - 2⁸ = 656338213 is a prime.

It is a super-2 number, since 2×656338469² = 861560371778527922, which 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 (656338439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11316152 + ... + 11316209.

It is an arithmetic number, because the mean of its divisors is an integer number (169742715).

Almost surely, 2^656338469 is an apocalyptic number.

It is an amenable number.

656338469 is a deficient number, since it is larger than the sum of its proper divisors (22632391).

656338469 is a wasteful number, since it uses less digits than its factorization.

656338469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22632390.

The product of its digits is 2799360, while the sum is 50.

The square root of 656338469 is about 25619.1035947786. The cubic root of 656338469 is about 869.0457097020.

The spelling of 656338469 in words is "six hundred fifty-six million, three hundred thirty-eight thousand, four hundred sixty-nine".