25564138639368 has 128 divisors (see below), whose sum is σ = 75418188963840. Its totient is φ = 7066395648000.

The previous prime is 25564138639349. The next prime is 25564138639381. The reversal of 25564138639368 is 86393683146552.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17478088 + ... + 18884168.

It is an arithmetic number, because the mean of its divisors is an integer number (589204601280).

Almost surely, 2^{25564138639368} is an apocalyptic number.

25564138639368 is a gapful number since it is divisible by the number (28) 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 25564138639368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37709094481920).

25564138639368 is an abundant number, since it is smaller than the sum of its proper divisors (49854050324472).

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

25564138639368 is a wasteful number, since it uses less digits than its factorization.

25564138639368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409619 (or 1409615 counting only the distinct ones).

The product of its digits is 671846400, while the sum is 69.

The spelling of 25564138639368 in words is "twenty-five trillion, five hundred sixty-four billion, one hundred thirty-eight million, six hundred thirty-nine thousand, three hundred sixty-eight".