57315109831561 has 2 divisors, whose sum is σ = 57315109831562. Its totient is φ = 57315109831560.

The previous prime is 57315109831493. The next prime is 57315109831583. The reversal of 57315109831561 is 16513890151375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31907461471561 + 25407648360000 = 5648669^2 + 5040600^2 .

It is a cyclic number.

It is not a de Polignac number, because 57315109831561 - 2¹³ = 57315109823369 is a prime.

It is not a weakly prime, because it can be changed into another prime (57315109831591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28657554915780 + 28657554915781.

It is an arithmetic number, because the mean of its divisors is an integer number (28657554915781).

Almost surely, 2^{57315109831561} is an apocalyptic number.

It is an amenable number.

57315109831561 is a deficient number, since it is larger than the sum of its proper divisors (1).

57315109831561 is an equidigital number, since it uses as much as digits as its factorization.

57315109831561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402000, while the sum is 55.

The spelling of 57315109831561 in words is "fifty-seven trillion, three hundred fifteen billion, one hundred nine million, eight hundred thirty-one thousand, five hundred sixty-one".