12453621639 has 4 divisors (see below), whose sum is σ = 16604828856. Its totient is φ = 8302414424.

The previous prime is 12453621623. The next prime is 12453621659. The reversal of 12453621639 is 93612635421.

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

It is a cyclic number.

It is not a de Polignac number, because 12453621639 - 2⁴ = 12453621623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12453621639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12453621619) 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, 2075603604 + ... + 2075603609.

It is an arithmetic number, because the mean of its divisors is an integer number (4151207214).

Almost surely, 2^12453621639 is an apocalyptic number.

12453621639 is a deficient number, since it is larger than the sum of its proper divisors (4151207217).

12453621639 is an equidigital number, since it uses as much as digits as its factorization.

12453621639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151207216.

The product of its digits is 233280, while the sum is 42.

The spelling of 12453621639 in words is "twelve billion, four hundred fifty-three million, six hundred twenty-one thousand, six hundred thirty-nine".