25971110857 has 2 divisors, whose sum is σ = 25971110858. Its totient is φ = 25971110856.

The previous prime is 25971110833. The next prime is 25971110897. The reversal of 25971110857 is 75801117952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14473052416 + 11498058441 = 120304^2 + 107229^2 .

It is a cyclic number.

It is not a de Polignac number, because 25971110857 - 2⁷ = 25971110729 is a prime.

It is not a weakly prime, because it can be changed into another prime (25971110897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12985555428 + 12985555429.

It is an arithmetic number, because the mean of its divisors is an integer number (12985555429).

Almost surely, 2^25971110857 is an apocalyptic number.

It is an amenable number.

25971110857 is a deficient number, since it is larger than the sum of its proper divisors (1).

25971110857 is an equidigital number, since it uses as much as digits as its factorization.

25971110857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 46.

The spelling of 25971110857 in words is "twenty-five billion, nine hundred seventy-one million, one hundred ten thousand, eight hundred fifty-seven".