25505046720 has 672 divisors, whose sum is σ = 97677914880. Its totient is φ = 6315356160.

The previous prime is 25505046709. The next prime is 25505046757. The reversal of 25505046720 is 2764050552.

25505046720 is a `hidden beast` number, since 25 + 50 + 504 + 67 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 90123699 + ... + 90123981.

It is an arithmetic number, because the mean of its divisors is an integer number (145354040).

Almost surely, 2^25505046720 is an apocalyptic number.

25505046720 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 25505046720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48838957440).

25505046720 is an abundant number, since it is smaller than the sum of its proper divisors (72172868160).

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

25505046720 is a wasteful number, since it uses less digits than its factorization.

25505046720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The spelling of 25505046720 in words is "twenty-five billion, five hundred five million, forty-six thousand, seven hundred twenty".