12642855837 has 4 divisors (see below), whose sum is σ = 16857141120. Its totient is φ = 8428570556.

The previous prime is 12642855833. The next prime is 12642855857. The reversal of 12642855837 is 73855824621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73855824621 = 3 ⋅24618608207.

It is a cyclic number.

It is not a de Polignac number, because 12642855837 - 2² = 12642855833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12642855837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642855833) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2107142637 + ... + 2107142642.

It is an arithmetic number, because the mean of its divisors is an integer number (4214285280).

Almost surely, 2^12642855837 is an apocalyptic number.

It is an amenable number.

12642855837 is a deficient number, since it is larger than the sum of its proper divisors (4214285283).

12642855837 is an equidigital number, since it uses as much as digits as its factorization.

12642855837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214285282.

The product of its digits is 3225600, while the sum is 51.

The spelling of 12642855837 in words is "twelve billion, six hundred forty-two million, eight hundred fifty-five thousand, eight hundred thirty-seven".