25415518512 has 80 divisors (see below), whose sum is σ = 68746099968. Its totient is φ = 8075738880.

The previous prime is 25415518487. The next prime is 25415518529. The reversal of 25415518512 is 21581551452.

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, 284187 + ... + 362757.

Almost surely, 2^25415518512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25415518512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34373049984).

25415518512 is an abundant number, since it is smaller than the sum of its proper divisors (43330581456).

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

25415518512 is a wasteful number, since it uses less digits than its factorization.

25415518512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78898 (or 78892 counting only the distinct ones).

The product of its digits is 80000, while the sum is 39.

The spelling of 25415518512 in words is "twenty-five billion, four hundred fifteen million, five hundred eighteen thousand, five hundred twelve".