656044636441 has 2 divisors, whose sum is σ = 656044636442. Its totient is φ = 656044636440.

The previous prime is 656044636427. The next prime is 656044636451. The reversal of 656044636441 is 144636440656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643357993216 + 12686643225 = 802096^2 + 112635^2 .

It is a cyclic number.

It is not a de Polignac number, because 656044636441 - 2¹⁹ = 656044112153 is a prime.

It is not a weakly prime, because it can be changed into another prime (656044636421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328022318220 + 328022318221.

It is an arithmetic number, because the mean of its divisors is an integer number (328022318221).

Almost surely, 2^656044636441 is an apocalyptic number.

It is an amenable number.

656044636441 is a deficient number, since it is larger than the sum of its proper divisors (1).

656044636441 is an equidigital number, since it uses as much as digits as its factorization.

656044636441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 656044636441 in words is "six hundred fifty-six billion, forty-four million, six hundred thirty-six thousand, four hundred forty-one".