25897885515 has 64 divisors (see below), whose sum is σ = 48281270400. Its totient is φ = 13153093632.

The previous prime is 25897885513. The next prime is 25897885537. The reversal of 25897885515 is 51558879852.

25897885515 is a `hidden beast` number, since 2 + 5 + 8 + 9 + 78 + 8 + 551 + 5 = 666.

It is not a de Polignac number, because 25897885515 - 2¹ = 25897885513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25897885513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 240487 + ... + 331103.

It is an arithmetic number, because the mean of its divisors is an integer number (754394850).

Almost surely, 2^25897885515 is an apocalyptic number.

25897885515 is a deficient number, since it is larger than the sum of its proper divisors (22383384885).

25897885515 is a wasteful number, since it uses less digits than its factorization.

25897885515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90733 (or 90727 counting only the distinct ones).

The product of its digits is 40320000, while the sum is 63.

The spelling of 25897885515 in words is "twenty-five billion, eight hundred ninety-seven million, eight hundred eighty-five thousand, five hundred fifteen".