8561955757 has 2 divisors, whose sum is σ = 8561955758. Its totient is φ = 8561955756.

The previous prime is 8561955653. The next prime is 8561955767. The reversal of 8561955757 is 7575591658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6760292841 + 1801662916 = 82221^2 + 42446^2 .

It is a cyclic number.

It is not a de Polignac number, because 8561955757 - 2²⁷ = 8427738029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8561955767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4280977878 + 4280977879.

It is an arithmetic number, because the mean of its divisors is an integer number (4280977879).

Almost surely, 2^8561955757 is an apocalyptic number.

It is an amenable number.

8561955757 is a deficient number, since it is larger than the sum of its proper divisors (1).

8561955757 is an equidigital number, since it uses as much as digits as its factorization.

8561955757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230000, while the sum is 58.

The square root of 8561955757 is about 92530.8367896887. The cubic root of 8561955757 is about 2045.7740234282.

It can be divided in two parts, 85619 and 55757, that added together give a square (141376 = 376²).

The spelling of 8561955757 in words is "eight billion, five hundred sixty-one million, nine hundred fifty-five thousand, seven hundred fifty-seven".