25443521616 has 40 divisors (see below), whose sum is σ = 66629505280. Its totient is φ = 8364992256.

The previous prime is 25443521603. The next prime is 25443521627. The reversal of 25443521616 is 61612534452.

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, 3627136 + ... + 3634143.

It is an arithmetic number, because the mean of its divisors is an integer number (1665737632).

Almost surely, 2^25443521616 is an apocalyptic number.

It is an amenable number.

25443521616 is an abundant number, since it is smaller than the sum of its proper divisors (41185983664).

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

25443521616 is a wasteful number, since it uses less digits than its factorization.

25443521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7261363 (or 7261357 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The spelling of 25443521616 in words is "twenty-five billion, four hundred forty-three million, five hundred twenty-one thousand, six hundred sixteen".