656363861 has 2 divisors, whose sum is σ = 656363862. Its totient is φ = 656363860.

The previous prime is 656363833. The next prime is 656363867. The reversal of 656363861 is 168363656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655052836 + 1311025 = 25594^2 + 1145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656363861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656363867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328181930 + 328181931.

It is an arithmetic number, because the mean of its divisors is an integer number (328181931).

Almost surely, 2^656363861 is an apocalyptic number.

It is an amenable number.

656363861 is a deficient number, since it is larger than the sum of its proper divisors (1).

656363861 is an equidigital number, since it uses as much as digits as its factorization.

656363861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 656363861 is about 25619.5991576761. The cubic root of 656363861 is about 869.0569165844.

The spelling of 656363861 in words is "six hundred fifty-six million, three hundred sixty-three thousand, eight hundred sixty-one".