25318278081 has 8 divisors (see below), whose sum is σ = 37508560160. Its totient is φ = 16878852036.

The previous prime is 25318278061. The next prime is 25318278113. The reversal of 25318278081 is 18087281352.

It is not a de Polignac number, because 25318278081 - 2¹⁷ = 25318147009 is a prime.

It is a super-2 number, since 2×25318278081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25318278061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468856975 + ... + 468857028.

It is an arithmetic number, because the mean of its divisors is an integer number (4688570020).

Almost surely, 2^25318278081 is an apocalyptic number.

It is an amenable number.

25318278081 is a deficient number, since it is larger than the sum of its proper divisors (12190282079).

25318278081 is an equidigital number, since it uses as much as digits as its factorization.

25318278081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937714012 (or 937714006 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 25318278081 in words is "twenty-five billion, three hundred eighteen million, two hundred seventy-eight thousand, eighty-one".