12215643453 has 40 divisors (see below), whose sum is σ = 19793373600. Its totient is φ = 7463148192.

The previous prime is 12215643449. The next prime is 12215643541. The reversal of 12215643453 is 35434651221.

12215643453 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 5 + 643 + 4 + 5 + 3 = 666.

It is not a de Polignac number, because 12215643453 - 2² = 12215643449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215643353) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 104638 + ... + 188096.

It is an arithmetic number, because the mean of its divisors is an integer number (494834340).

Almost surely, 2^12215643453 is an apocalyptic number.

12215643453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12215643453 is a deficient number, since it is larger than the sum of its proper divisors (7577730147).

12215643453 is a wasteful number, since it uses less digits than its factorization.

12215643453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83623 (or 83614 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 12215643453 in words is "twelve billion, two hundred fifteen million, six hundred forty-three thousand, four hundred fifty-three".