25515570780 has 192 divisors, whose sum is σ = 90870958080. Its totient is φ = 5822558208.

The previous prime is 25515570779. The next prime is 25515570901. The reversal of 25515570780 is 8707551552.

25515570780 is a `hidden beast` number, since 2 + 5 + 5 + 1 + 5 + 570 + 78 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2440444 + ... + 2450876.

It is an arithmetic number, because the mean of its divisors is an integer number (473286240).

Almost surely, 2^25515570780 is an apocalyptic number.

25515570780 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 25515570780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45435479040).

25515570780 is an abundant number, since it is smaller than the sum of its proper divisors (65355387300).

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

25515570780 is a wasteful number, since it uses less digits than its factorization.

25515570780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11105 (or 11097 counting only the distinct ones).

The product of its (nonzero) digits is 490000, while the sum is 45.

The spelling of 25515570780 in words is "twenty-five billion, five hundred fifteen million, five hundred seventy thousand, seven hundred eighty".