25508561796 has 135 divisors (see below), whose sum is σ = 70529873799. Its totient is φ = 8038086192.

The previous prime is 25508561753. The next prime is 25508561797. The reversal of 25508561796 is 69716580552.

The square root of 25508561796 is 159714.

It is a perfect power (a square), and thus also a powerful number.

25508561796 is a `hidden beast` number, since 2 + 5 + 5 + 0 + 8 + 561 + 79 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (25508561797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 54621955 + ... + 54622421.

Almost surely, 2^25508561796 is an apocalyptic number.

25508561796 is the 159714-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25508561796

25508561796 is an abundant number, since it is smaller than the sum of its proper divisors (45021312003).

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

25508561796 is an equidigital number, since it uses as much as digits as its factorization.

25508561796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 25508561796 in words is "twenty-five billion, five hundred eight million, five hundred sixty-one thousand, seven hundred ninety-six".