25494505920 has 448 divisors, whose sum is σ = 98471614080. Its totient is φ = 6172692480.

The previous prime is 25494505909. The next prime is 25494505921. The reversal of 25494505920 is 2950549452.

25494505920 is a `hidden beast` number, since 2 + 5 + 4 + 9 + 4 + 50 + 592 + 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 not an unprimeable number, because it can be changed into a prime (25494505921) by changing a digit.

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, 417942690 + ... + 417942750.

It is an arithmetic number, because the mean of its divisors is an integer number (219802710).

Almost surely, 2^25494505920 is an apocalyptic number.

25494505920 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 25494505920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49235807040).

25494505920 is an abundant number, since it is smaller than the sum of its proper divisors (72977108160).

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

25494505920 is an frugal number, since it uses more digits than its factorization.

25494505920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 25494505920 in words is "twenty-five billion, four hundred ninety-four million, five hundred five thousand, nine hundred twenty".