25618111409 has 24 divisors (see below), whose sum is σ = 28582939560. Its totient is φ = 22939234560.

The previous prime is 25618111381. The next prime is 25618111411. The reversal of 25618111409 is 90411181652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14061216400 + 11556895009 = 118580^2 + 107503^2 .

It is not a de Polignac number, because 25618111409 - 2²⁴ = 25601334193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25618111499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8805047 + ... + 8807955.

It is an arithmetic number, because the mean of its divisors is an integer number (1190955815).

Almost surely, 2^25618111409 is an apocalyptic number.

It is an amenable number.

25618111409 is a deficient number, since it is larger than the sum of its proper divisors (2964828151).

25618111409 is a wasteful number, since it uses less digits than its factorization.

25618111409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001 (or 3990 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 25618111409 in words is "twenty-five billion, six hundred eighteen million, one hundred eleven thousand, four hundred nine".