25494991836 has 24 divisors (see below), whose sum is σ = 59492509440. Its totient is φ = 8497731312.

The previous prime is 25494991813. The next prime is 25494991849. The reversal of 25494991836 is 63819949452.

It is a self number, because there is not a number n which added to its sum of digits gives 25494991836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123325 + ... + 257291.

It is an arithmetic number, because the mean of its divisors is an integer number (2478854560).

Almost surely, 2^25494991836 is an apocalyptic number.

It is an amenable number.

25494991836 is an abundant number, since it is smaller than the sum of its proper divisors (33997517604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25494991836 is a wasteful number, since it uses less digits than its factorization.

25494991836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149833 (or 149831 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 60.

The spelling of 25494991836 in words is "twenty-five billion, four hundred ninety-four million, nine hundred ninety-one thousand, eight hundred thirty-six".