12643245555 has 16 divisors (see below), whose sum is σ = 20282019840. Its totient is φ = 6725455328.

The previous prime is 12643245541. The next prime is 12643245599. The reversal of 12643245555 is 55554234621.

It is a cyclic number.

It is not a de Polignac number, because 12643245555 - 2¹⁸ = 12642983411 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1094625 + ... + 1106114.

It is an arithmetic number, because the mean of its divisors is an integer number (1267626240).

Almost surely, 2^12643245555 is an apocalyptic number.

12643245555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12643245555 is a deficient number, since it is larger than the sum of its proper divisors (7638774285).

12643245555 is a wasteful number, since it uses less digits than its factorization.

12643245555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201130.

The product of its digits is 720000, while the sum is 42.

The spelling of 12643245555 in words is "twelve billion, six hundred forty-three million, two hundred forty-five thousand, five hundred fifty-five".