656227813 has 4 divisors (see below), whose sum is σ = 666985708. Its totient is φ = 645469920.

The previous prime is 656227811. The next prime is 656227843. The reversal of 656227813 is 318722656.

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 301960129 + 354267684 = 17377^2 + 18822^2 .

It is a cyclic number.

It is not a de Polignac number, because 656227813 - 2¹ = 656227811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656227811) 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, 5378856 + ... + 5378977.

It is an arithmetic number, because the mean of its divisors is an integer number (166746427).

Almost surely, 2^656227813 is an apocalyptic number.

It is an amenable number.

656227813 is a deficient number, since it is larger than the sum of its proper divisors (10757895).

656227813 is a wasteful number, since it uses less digits than its factorization.

656227813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757894.

The product of its digits is 120960, while the sum is 40.

The square root of 656227813 is about 25616.9438653404. The cubic root of 656227813 is about 868.9968677648.

The spelling of 656227813 in words is "six hundred fifty-six million, two hundred twenty-seven thousand, eight hundred thirteen".