25085500857 has 6 divisors (see below), whose sum is σ = 36234612362. Its totient is φ = 16723667232.

The previous prime is 25085500841. The next prime is 25085500871. The reversal of 25085500857 is 75800558052.

It can be written as a sum of positive squares in only one way, i.e., 18885355776 + 6200145081 = 137424^2 + 78741^2 .

It is not a de Polignac number, because 25085500857 - 2⁴ = 25085500841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25085500897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1393638928 + ... + 1393638945.

Almost surely, 2^25085500857 is an apocalyptic number.

It is an amenable number.

25085500857 is a deficient number, since it is larger than the sum of its proper divisors (11149111505).

25085500857 is a wasteful number, since it uses less digits than its factorization.

25085500857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787277879 (or 2787277876 counting only the distinct ones).

The product of its (nonzero) digits is 560000, while the sum is 45.

The spelling of 25085500857 in words is "twenty-five billion, eighty-five million, five hundred thousand, eight hundred fifty-seven".