25803566780 has 12 divisors (see below), whose sum is σ = 54187490280. Its totient is φ = 10321426704.

The previous prime is 25803566749. The next prime is 25803566783. The reversal of 25803566780 is 8766530852.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25803566783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645089150 + ... + 645089189.

It is an arithmetic number, because the mean of its divisors is an integer number (4515624190).

Almost surely, 2^25803566780 is an apocalyptic number.

25803566780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25803566780 is an abundant number, since it is smaller than the sum of its proper divisors (28383923500).

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

25803566780 is a wasteful number, since it uses less digits than its factorization.

25803566780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290178348 (or 1290178346 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 25803566780 in words is "twenty-five billion, eight hundred three million, five hundred sixty-six thousand, seven hundred eighty".