12915321643 has 8 divisors (see below), whose sum is σ = 14763103488. Its totient is φ = 11068223784.

The previous prime is 12915321599. The next prime is 12915321691. The reversal of 12915321643 is 34612351921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12915321643 - 2²⁹ = 12378450731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12915321943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129871 + ... + 206632.

It is an arithmetic number, because the mean of its divisors is an integer number (1845387936).

Almost surely, 2^12915321643 is an apocalyptic number.

12915321643 is a deficient number, since it is larger than the sum of its proper divisors (1847781845).

12915321643 is an equidigital number, since it uses as much as digits as its factorization.

12915321643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341993.

The product of its digits is 38880, while the sum is 37.

The spelling of 12915321643 in words is "twelve billion, nine hundred fifteen million, three hundred twenty-one thousand, six hundred forty-three".