57251815261 has 2 divisors, whose sum is σ = 57251815262. Its totient is φ = 57251815260.

The previous prime is 57251815253. The next prime is 57251815277. The reversal of 57251815261 is 16251815275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57249654361 + 2160900 = 239269^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 57251815261 - 2³ = 57251815253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57251815561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28625907630 + 28625907631.

It is an arithmetic number, because the mean of its divisors is an integer number (28625907631).

Almost surely, 2^57251815261 is an apocalyptic number.

It is an amenable number.

57251815261 is a deficient number, since it is larger than the sum of its proper divisors (1).

57251815261 is an equidigital number, since it uses as much as digits as its factorization.

57251815261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 43.

The spelling of 57251815261 in words is "fifty-seven billion, two hundred fifty-one million, eight hundred fifteen thousand, two hundred sixty-one".