25263617616 has 60 divisors (see below), whose sum is σ = 71219177172. Its totient is φ = 8359730688.

The previous prime is 25263617609. The next prime is 25263617647. The reversal of 25263617616 is 61671636252.

25263617616 is a `hidden beast` number, since 2 + 5 + 2 + 636 + 1 + 7 + 6 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18905150016 + 6358467600 = 137496^2 + 79740^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 620571 + ... + 660026.

Almost surely, 2^25263617616 is an apocalyptic number.

It is an amenable number.

25263617616 is an abundant number, since it is smaller than the sum of its proper divisors (45955559556).

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

25263617616 is a wasteful number, since it uses less digits than its factorization.

25263617616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280748 (or 1280739 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 25263617616 in words is "twenty-five billion, two hundred sixty-three million, six hundred seventeen thousand, six hundred sixteen".