25297475840 has 288 divisors, whose sum is σ = 75381411840. Its totient is φ = 7920156672.

The previous prime is 25297475761. The next prime is 25297475909. The reversal of 25297475840 is 4857479252.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11297441 + ... + 11299679.

Almost surely, 2^25297475840 is an apocalyptic number.

25297475840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25297475840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37690705920).

25297475840 is an abundant number, since it is smaller than the sum of its proper divisors (50083936000).

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

25297475840 is a wasteful number, since it uses less digits than its factorization.

25297475840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 25297475840 in words is "twenty-five billion, two hundred ninety-seven million, four hundred seventy-five thousand, eight hundred forty".