25454639065 has 16 divisors (see below), whose sum is σ = 31217908176. Its totient is φ = 19919174400.

The previous prime is 25454639047. The next prime is 25454639071. The reversal of 25454639065 is 56093645452.

It can be written as a sum of positive squares in 8 ways, for example, as 15014091024 + 10440548041 = 122532^2 + 102179^2 .

It is not a de Polignac number, because 25454639065 - 2¹¹ = 25454637017 is a prime.

It is a Duffinian number.

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, 175342 + ... + 285751.

It is an arithmetic number, because the mean of its divisors is an integer number (1951119261).

Almost surely, 2^25454639065 is an apocalyptic number.

It is an amenable number.

25454639065 is a deficient number, since it is larger than the sum of its proper divisors (5763269111).

25454639065 is a wasteful number, since it uses less digits than its factorization.

25454639065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461340.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 25454639065 in words is "twenty-five billion, four hundred fifty-four million, six hundred thirty-nine thousand, sixty-five".