25081017720 has 256 divisors, whose sum is σ = 85707072000. Its totient is φ = 5815756800.

The previous prime is 25081017707. The next prime is 25081017743. The reversal of 25081017720 is 2771018052.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4169515 + ... + 4175525.

It is an arithmetic number, because the mean of its divisors is an integer number (334793250).

Almost surely, 2^25081017720 is an apocalyptic number.

25081017720 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 25081017720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42853536000).

25081017720 is an abundant number, since it is smaller than the sum of its proper divisors (60626054280).

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

25081017720 is a wasteful number, since it uses less digits than its factorization.

25081017720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174 (or 6170 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The spelling of 25081017720 in words is "twenty-five billion, eighty-one million, seventeen thousand, seven hundred twenty".