25801237780 has 12 divisors (see below), whose sum is σ = 54182599380. Its totient is φ = 10320495104.

The previous prime is 25801237769. The next prime is 25801237793. The reversal of 25801237780 is 8773210852.

It can be written as a sum of positive squares in 2 ways, for example, as 10771948944 + 15029288836 = 103788^2 + 122594^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645030925 + ... + 645030964.

It is an arithmetic number, because the mean of its divisors is an integer number (4515216615).

Almost surely, 2^25801237780 is an apocalyptic number.

25801237780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25801237780 is an abundant number, since it is smaller than the sum of its proper divisors (28381361600).

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

25801237780 is a wasteful number, since it uses less digits than its factorization.

25801237780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290061898 (or 1290061896 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 25801237780 in words is "twenty-five billion, eight hundred one million, two hundred thirty-seven thousand, seven hundred eighty".