25280891065 has 16 divisors (see below), whose sum is σ = 31414533120. Its totient is φ = 19510522560.

The previous prime is 25280891039. The next prime is 25280891081. The reversal of 25280891065 is 56019808252.

It is not a de Polignac number, because 25280891065 - 2⁷ = 25280890937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208125 + ... + 306394.

It is an arithmetic number, because the mean of its divisors is an integer number (1963408320).

Almost surely, 2^25280891065 is an apocalyptic number.

It is an amenable number.

25280891065 is a deficient number, since it is larger than the sum of its proper divisors (6133642055).

25280891065 is a wasteful number, since it uses less digits than its factorization.

25280891065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514872.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 25280891065 in words is "twenty-five billion, two hundred eighty million, eight hundred ninety-one thousand, sixty-five".