25797118464 has 400 divisors, whose sum is σ = 84429908640. Its totient is φ = 7793418240.

The previous prime is 25797118433. The next prime is 25797118511. The reversal of 25797118464 is 46481179752.

25797118464 is a `hidden beast` number, since 2 + 579 + 7 + 1 + 1 + 8 + 4 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 25797118464.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31808619 + ... + 31809429.

Almost surely, 2^25797118464 is an apocalyptic number.

25797118464 is a gapful number since it is divisible by the number (24) 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 25797118464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42214954320).

25797118464 is an abundant number, since it is smaller than the sum of its proper divisors (58632790176).

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

25797118464 is an equidigital number, since it uses as much as digits as its factorization.

25797118464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 888 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 25797118464 in words is "twenty-five billion, seven hundred ninety-seven million, one hundred eighteen thousand, four hundred sixty-four".