25531620120 has 512 divisors, whose sum is σ = 95551488000. Its totient is φ = 6033139200.

The previous prime is 25531620113. The next prime is 25531620131. The reversal of 25531620120 is 2102613552.

It is a happy number.

25531620120 is a `hidden beast` number, since 2 + 5 + 5 + 31 + 620 + 1 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 127 ways as a sum of consecutive naturals, for example, 22181545 + ... + 22182695.

It is an arithmetic number, because the mean of its divisors is an integer number (186624000).

Almost surely, 2^25531620120 is an apocalyptic number.

25531620120 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 25531620120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47775744000).

25531620120 is an abundant number, since it is smaller than the sum of its proper divisors (70019867880).

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

25531620120 is a wasteful number, since it uses less digits than its factorization.

25531620120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 25531620120 in words is "twenty-five billion, five hundred thirty-one million, six hundred twenty thousand, one hundred twenty".