12864857550 has 24 divisors (see below), whose sum is σ = 31904847096. Its totient is φ = 3430628640.

The previous prime is 12864857543. The next prime is 12864857563. The reversal of 12864857550 is 5575846821.

It is a junction number, because it is equal to n+sod(n) for n = 12864857493 and 12864857502.

It is a congruent number.

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, 42882709 + ... + 42883008.

It is an arithmetic number, because the mean of its divisors is an integer number (1329368629).

Almost surely, 2^12864857550 is an apocalyptic number.

12864857550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12864857550 is an abundant number, since it is smaller than the sum of its proper divisors (19039989546).

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

12864857550 is a wasteful number, since it uses less digits than its factorization.

12864857550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85765732 (or 85765727 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 51.

The spelling of 12864857550 in words is "twelve billion, eight hundred sixty-four million, eight hundred fifty-seven thousand, five hundred fifty".