57251721173 has 2 divisors, whose sum is σ = 57251721174. Its totient is φ = 57251721172.

The previous prime is 57251721157. The next prime is 57251721217. The reversal of 57251721173 is 37112715275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35376719569 + 21875001604 = 188087^2 + 147902^2 .

It is a cyclic number.

It is not a de Polignac number, because 57251721173 - 2⁴ = 57251721157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57251721173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57251721133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28625860586 + 28625860587.

It is an arithmetic number, because the mean of its divisors is an integer number (28625860587).

Almost surely, 2^57251721173 is an apocalyptic number.

It is an amenable number.

57251721173 is a deficient number, since it is larger than the sum of its proper divisors (1).

57251721173 is an equidigital number, since it uses as much as digits as its factorization.

57251721173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102900, while the sum is 41.

The spelling of 57251721173 in words is "fifty-seven billion, two hundred fifty-one million, seven hundred twenty-one thousand, one hundred seventy-three".