25563673380 has 384 divisors, whose sum is σ = 88833024000. Its totient is φ = 5478240768.

The previous prime is 25563673351. The next prime is 25563673397. The reversal of 25563673380 is 8337636552.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 25086511 + ... + 25087529.

It is an arithmetic number, because the mean of its divisors is an integer number (231336000).

Almost surely, 2^25563673380 is an apocalyptic number.

25563673380 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 25563673380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44416512000).

25563673380 is an abundant number, since it is smaller than the sum of its proper divisors (63269350620).

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

25563673380 is a wasteful number, since it uses less digits than its factorization.

25563673380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 48.

The spelling of 25563673380 in words is "twenty-five billion, five hundred sixty-three million, six hundred seventy-three thousand, three hundred eighty".