25537597222536 has 640 divisors, whose sum is σ = 87256046592000. Its totient is φ = 6816113515008.

The previous prime is 25537597222507. The next prime is 25537597222549. The reversal of 25537597222536 is 63522279573552.

25537597222536 is a `hidden beast` number, since 2 + 5 + 5 + 3 + 7 + 5 + 9 + 72 + 22 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2121585510 + ... + 2121597546.

It is an arithmetic number, because the mean of its divisors is an integer number (136337572800).

Almost surely, 2^{25537597222536} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25537597222536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43628023296000).

25537597222536 is an abundant number, since it is smaller than the sum of its proper divisors (61718449369464).

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

25537597222536 is a wasteful number, since it uses less digits than its factorization.

25537597222536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12423 (or 12410 counting only the distinct ones).

The product of its digits is 238140000, while the sum is 63.

The spelling of 25537597222536 in words is "twenty-five trillion, five hundred thirty-seven billion, five hundred ninety-seven million, two hundred twenty-two thousand, five hundred thirty-six".