656111413681 has 2 divisors, whose sum is σ = 656111413682. Its totient is φ = 656111413680.

The previous prime is 656111413651. The next prime is 656111413691. The reversal of 656111413681 is 186314111656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598611690000 + 57499723681 = 773700^2 + 239791^2 .

It is a cyclic number.

It is not a de Polignac number, because 656111413681 - 2¹¹ = 656111411633 is a prime.

It is a super-2 number, since 2×656111413681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656111413621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328055706840 + 328055706841.

It is an arithmetic number, because the mean of its divisors is an integer number (328055706841).

Almost surely, 2^656111413681 is an apocalyptic number.

It is an amenable number.

656111413681 is a deficient number, since it is larger than the sum of its proper divisors (1).

656111413681 is an equidigital number, since it uses as much as digits as its factorization.

656111413681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The spelling of 656111413681 in words is "six hundred fifty-six billion, one hundred eleven million, four hundred thirteen thousand, six hundred eighty-one".