25696538172550 has 24 divisors (see below), whose sum is σ = 54623498287536. Its totient is φ = 8810241659040.

The previous prime is 25696538172511. The next prime is 25696538172551. The reversal of 25696538172550 is 5527183569652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25696538172551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36709339897 + ... + 36709340596.

It is an arithmetic number, because the mean of its divisors is an integer number (2275979095314).

Almost surely, 2^{25696538172550} is an apocalyptic number.

25696538172550 is an abundant number, since it is smaller than the sum of its proper divisors (28926960114986).

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

25696538172550 is a wasteful number, since it uses less digits than its factorization.

25696538172550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73418680512 (or 73418680507 counting only the distinct ones).

The product of its (nonzero) digits is 136080000, while the sum is 64.

The spelling of 25696538172550 in words is "twenty-five trillion, six hundred ninety-six billion, five hundred thirty-eight million, one hundred seventy-two thousand, five hundred fifty".