25563441980 has 12 divisors (see below), whose sum is σ = 53683228200. Its totient is φ = 10225376784.

The previous prime is 25563441961. The next prime is 25563441989. The reversal of 25563441980 is 8914436552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25563441989) 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, 639086030 + ... + 639086069.

It is an arithmetic number, because the mean of its divisors is an integer number (4473602350).

Almost surely, 2^25563441980 is an apocalyptic number.

25563441980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25563441980 is an abundant number, since it is smaller than the sum of its proper divisors (28119786220).

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

25563441980 is a wasteful number, since it uses less digits than its factorization.

25563441980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278172108 (or 1278172106 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 25563441980 in words is "twenty-five billion, five hundred sixty-three million, four hundred forty-one thousand, nine hundred eighty".