25499536920 has 384 divisors, whose sum is σ = 103092575040. Its totient is φ = 5370347520.

The previous prime is 25499536889. The next prime is 25499536921. The reversal of 25499536920 is 2963599452.

It is a happy number.

25499536920 is a `hidden beast` number, since 2 + 549 + 9 + 5 + 3 + 6 + 92 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25499536921) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 860592 + ... + 889728.

Almost surely, 2^25499536920 is an apocalyptic number.

25499536920 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 25499536920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51546287520).

25499536920 is an abundant number, since it is smaller than the sum of its proper divisors (77593038120).

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

25499536920 is a wasteful number, since it uses less digits than its factorization.

25499536920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29195 (or 29188 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 25499536920 in words is "twenty-five billion, four hundred ninety-nine million, five hundred thirty-six thousand, nine hundred twenty".