25645340500 has 96 divisors (see below), whose sum is σ = 60379038720. Its totient is φ = 9459446400.

The previous prime is 25645340491. The next prime is 25645340503. The reversal of 25645340500 is 504354652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645340503) 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 31 ways as a sum of consecutive naturals, for example, 11432379 + ... + 11434621.

It is an arithmetic number, because the mean of its divisors is an integer number (628948320).

Almost surely, 2^25645340500 is an apocalyptic number.

25645340500 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 25645340500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30189519360).

25645340500 is an abundant number, since it is smaller than the sum of its proper divisors (34733698220).

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

25645340500 is a wasteful number, since it uses less digits than its factorization.

25645340500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034 (or 4022 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 25645340500 in words is "twenty-five billion, six hundred forty-five million, three hundred forty thousand, five hundred".