12643762815 has 24 divisors (see below), whose sum is σ = 21927665760. Its totient is φ = 6739706304.

The previous prime is 12643762787. The next prime is 12643762847. The reversal of 12643762815 is 51826734621.

12643762815 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 3 + 7 + 628 + 15 = 666.

12643762815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12643762815 - 2⁸ = 12643762559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9789 + ... + 159321.

It is an arithmetic number, because the mean of its divisors is an integer number (913652740).

Almost surely, 2^12643762815 is an apocalyptic number.

12643762815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12643762815 is a deficient number, since it is larger than the sum of its proper divisors (9283902945).

12643762815 is a wasteful number, since it uses less digits than its factorization.

12643762815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151423 (or 151420 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 12643762815 in words is "twelve billion, six hundred forty-three million, seven hundred sixty-two thousand, eight hundred fifteen".