57261208729 has 2 divisors, whose sum is σ = 57261208730. Its totient is φ = 57261208728.

The previous prime is 57261208721. The next prime is 57261208747. The reversal of 57261208729 is 92780216275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45231506329 + 12029702400 = 212677^2 + 109680^2 .

It is a cyclic number.

It is not a de Polignac number, because 57261208729 - 2³ = 57261208721 is a prime.

It is a super-2 number, since 2×57261208729² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57261208721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28630604364 + 28630604365.

It is an arithmetic number, because the mean of its divisors is an integer number (28630604365).

Almost surely, 2^57261208729 is an apocalyptic number.

It is an amenable number.

57261208729 is a deficient number, since it is larger than the sum of its proper divisors (1).

57261208729 is an equidigital number, since it uses as much as digits as its factorization.

57261208729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 57261208729 in words is "fifty-seven billion, two hundred sixty-one million, two hundred eight thousand, seven hundred twenty-nine".