57000732781 has 2 divisors, whose sum is σ = 57000732782. Its totient is φ = 57000732780.

The previous prime is 57000732749. The next prime is 57000732793. The reversal of 57000732781 is 18723700075.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28698054025 + 28302678756 = 169405^2 + 168234^2 .

It is a cyclic number.

It is not a de Polignac number, because 57000732781 - 2⁵ = 57000732749 is a prime.

It is a super-2 number, since 2×57000732781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57000732881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28500366390 + 28500366391.

It is an arithmetic number, because the mean of its divisors is an integer number (28500366391).

Almost surely, 2^57000732781 is an apocalyptic number.

It is an amenable number.

57000732781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57000732781 is an equidigital number, since it uses as much as digits as its factorization.

57000732781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 57000732781 in words is "fifty-seven billion, seven hundred thirty-two thousand, seven hundred eighty-one".