12565557422 has 72 divisors (see below), whose sum is σ = 21737500848. Its totient is φ = 5442360000.

The previous prime is 12565557397. The next prime is 12565557439. The reversal of 12565557422 is 22475556521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16511522 + ... + 16512282.

It is an arithmetic number, because the mean of its divisors is an integer number (301909734).

Almost surely, 2^12565557422 is an apocalyptic number.

12565557422 is a deficient number, since it is larger than the sum of its proper divisors (9171943426).

12565557422 is a wasteful number, since it uses less digits than its factorization.

12565557422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918 (or 876 counting only the distinct ones).

The product of its digits is 840000, while the sum is 44.

Subtracting 12565557422 from its reverse (22475556521), we obtain a palindrome (9909999099).

The spelling of 12565557422 in words is "twelve billion, five hundred sixty-five million, five hundred fifty-seven thousand, four hundred twenty-two".