25109447540 has 12 divisors (see below), whose sum is σ = 52729839876. Its totient is φ = 10043779008.

The previous prime is 25109447527. The next prime is 25109447569. The reversal of 25109447540 is 4574490152.

It can be written as a sum of positive squares in 2 ways, for example, as 11236848016 + 13872599524 = 106004^2 + 117782^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627736169 + ... + 627736208.

It is an arithmetic number, because the mean of its divisors is an integer number (4394153323).

Almost surely, 2^25109447540 is an apocalyptic number.

25109447540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25109447540 is an abundant number, since it is smaller than the sum of its proper divisors (27620392336).

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

25109447540 is a wasteful number, since it uses less digits than its factorization.

25109447540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255472386 (or 1255472384 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 25109447540 in words is "twenty-five billion, one hundred nine million, four hundred forty-seven thousand, five hundred forty".