523221657961 has 2 divisors, whose sum is σ = 523221657962. Its totient is φ = 523221657960.

The previous prime is 523221657851. The next prime is 523221657977. The reversal of 523221657961 is 169756122325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429377462361 + 93844195600 = 655269^2 + 306340^2 .

It is a cyclic number.

It is not a de Polignac number, because 523221657961 - 2²³ = 523213269353 is a prime.

It is not a weakly prime, because it can be changed into another prime (523221357961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261610828980 + 261610828981.

It is an arithmetic number, because the mean of its divisors is an integer number (261610828981).

Almost surely, 2^523221657961 is an apocalyptic number.

It is an amenable number.

523221657961 is a deficient number, since it is larger than the sum of its proper divisors (1).

523221657961 is an equidigital number, since it uses as much as digits as its factorization.

523221657961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 49.

The spelling of 523221657961 in words is "five hundred twenty-three billion, two hundred twenty-one million, six hundred fifty-seven thousand, nine hundred sixty-one".