25515636480 has 216 divisors, whose sum is σ = 88441713360. Its totient is φ = 6791823360.

The previous prime is 25515636463. The next prime is 25515636499. The reversal of 25515636480 is 8463651552.

25515636480 is a `hidden beast` number, since 2 + 5 + 5 + 1 + 5 + 636 + 4 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7590000 + ... + 7593360.

Almost surely, 2^25515636480 is an apocalyptic number.

25515636480 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 25515636480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44220856680).

25515636480 is an abundant number, since it is smaller than the sum of its proper divisors (62926076880).

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

25515636480 is a wasteful number, since it uses less digits than its factorization.

25515636480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 25515636480 in words is "twenty-five billion, five hundred fifteen million, six hundred thirty-six thousand, four hundred eighty".