12643435500 has 96 divisors (see below), whose sum is σ = 38983508928. Its totient is φ = 3173248000.

The previous prime is 12643435471. The next prime is 12643435513. The reversal of 12643435500 is 553434621.

It is a super-2 number, since 2×12643435500² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222411 + ... + 273410.

It is an arithmetic number, because the mean of its divisors is an integer number (406078218).

Almost surely, 2^12643435500 is an apocalyptic number.

12643435500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643435500 is an abundant number, since it is smaller than the sum of its proper divisors (26340073428).

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

12643435500 is a wasteful number, since it uses less digits than its factorization.

12643435500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495860 (or 495848 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 12643435500 in words is "twelve billion, six hundred forty-three million, four hundred thirty-five thousand, five hundred".