561171488957 has 2 divisors, whose sum is σ = 561171488958. Its totient is φ = 561171488956.

The previous prime is 561171488903. The next prime is 561171488987. The reversal of 561171488957 is 759884171165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549475282756 + 11696206201 = 741266^2 + 108149^2 .

It is a cyclic number.

It is not a de Polignac number, because 561171488957 - 2⁶ = 561171488893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561171488957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561171488987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280585744478 + 280585744479.

It is an arithmetic number, because the mean of its divisors is an integer number (280585744479).

Almost surely, 2^561171488957 is an apocalyptic number.

It is an amenable number.

561171488957 is a deficient number, since it is larger than the sum of its proper divisors (1).

561171488957 is an equidigital number, since it uses as much as digits as its factorization.

561171488957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16934400, while the sum is 62.

The spelling of 561171488957 in words is "five hundred sixty-one billion, one hundred seventy-one million, four hundred eighty-eight thousand, nine hundred fifty-seven".