25563067780 has 72 divisors (see below), whose sum is σ = 56814488640. Its totient is φ = 9634766400.

The previous prime is 25563067771. The next prime is 25563067801. The reversal of 25563067780 is 8776036552.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16917225 + ... + 16918735.

It is an arithmetic number, because the mean of its divisors is an integer number (789090120).

Almost surely, 2^25563067780 is an apocalyptic number.

25563067780 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 25563067780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28407244320).

25563067780 is an abundant number, since it is smaller than the sum of its proper divisors (31251420860).

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

25563067780 is a wasteful number, since it uses less digits than its factorization.

25563067780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 25563067780 in words is "twenty-five billion, five hundred sixty-three million, sixty-seven thousand, seven hundred eighty".