656521362645461 has 2 divisors, whose sum is σ = 656521362645462. Its totient is φ = 656521362645460.

The previous prime is 656521362645427. The next prime is 656521362645487. The reversal of 656521362645461 is 164546263125656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462517971825361 + 194003390820100 = 21506231^2 + 13928510^2 .

It is a cyclic number.

It is not a de Polignac number, because 656521362645461 - 2¹⁰ = 656521362644437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656521362645394 and 656521362645403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656521362645761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328260681322730 + 328260681322731.

It is an arithmetic number, because the mean of its divisors is an integer number (328260681322731).

Almost surely, 2^{656521362645461} is an apocalyptic number.

It is an amenable number.

656521362645461 is a deficient number, since it is larger than the sum of its proper divisors (1).

656521362645461 is an equidigital number, since it uses as much as digits as its factorization.

656521362645461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624000, while the sum is 62.

The spelling of 656521362645461 in words is "six hundred fifty-six trillion, five hundred twenty-one billion, three hundred sixty-two million, six hundred forty-five thousand, four hundred sixty-one".