12643735522 has 24 divisors (see below), whose sum is σ = 21140130816. Its totient is φ = 5666199000.

The previous prime is 12643735483. The next prime is 12643735537. The reversal of 12643735522 is 22553734621.

It is a super-2 number, since 2×12643735522² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350754 + ... + 385117.

It is an arithmetic number, because the mean of its divisors is an integer number (880838784).

Almost surely, 2^12643735522 is an apocalyptic number.

12643735522 is a deficient number, since it is larger than the sum of its proper divisors (8496395294).

12643735522 is a wasteful number, since it uses less digits than its factorization.

12643735522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735966 (or 735955 counting only the distinct ones).

The product of its digits is 302400, while the sum is 40.

Subtracting 12643735522 from its reverse (22553734621), we obtain a palindrome (9909999099).

The spelling of 12643735522 in words is "twelve billion, six hundred forty-three million, seven hundred thirty-five thousand, five hundred twenty-two".