25781244780 has 48 divisors (see below), whose sum is σ = 75986830080. Its totient is φ = 6513156288.

The previous prime is 25781244779. The next prime is 25781244823. The reversal of 25781244780 is 8744218752.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11306424 + ... + 11308703.

It is an arithmetic number, because the mean of its divisors is an integer number (1583058960).

Almost surely, 2^25781244780 is an apocalyptic number.

25781244780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25781244780 is an abundant number, since it is smaller than the sum of its proper divisors (50205585300).

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

25781244780 is a wasteful number, since it uses less digits than its factorization.

25781244780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22615158 (or 22615156 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 48.

The spelling of 25781244780 in words is "twenty-five billion, seven hundred eighty-one million, two hundred forty-four thousand, seven hundred eighty".