12315623201643 has 4 divisors (see below), whose sum is σ = 16420830935528. Its totient is φ = 8210415467760.

The previous prime is 12315623201639. The next prime is 12315623201653. The reversal of 12315623201643 is 34610232651321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12315623201643 - 2² = 12315623201639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315623201633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052603866938 + ... + 2052603866943.

It is an arithmetic number, because the mean of its divisors is an integer number (4105207733882).

Almost surely, 2^{12315623201643} is an apocalyptic number.

12315623201643 is a deficient number, since it is larger than the sum of its proper divisors (4105207733885).

12315623201643 is an equidigital number, since it uses as much as digits as its factorization.

12315623201643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105207733884.

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 12315623201643 its reverse (34610232651321), we get a palindrome (46925855852964).

The spelling of 12315623201643 in words is "twelve trillion, three hundred fifteen billion, six hundred twenty-three million, two hundred one thousand, six hundred forty-three".