12215616651 has 18 divisors (see below), whose sum is σ = 20525560692. Its totient is φ = 6980352120.

The previous prime is 12215616643. The next prime is 12215616689. The reversal of 12215616651 is 15661651221.

12215616651 is a `hidden beast` number, since 1 + 22 + 15 + 616 + 6 + 5 + 1 = 666.

It is not a de Polignac number, because 12215616651 - 2³ = 12215616643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12215616691) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13849465 + ... + 13850346.

Almost surely, 2^12215616651 is an apocalyptic number.

12215616651 is a deficient number, since it is larger than the sum of its proper divisors (8309944041).

12215616651 is a wasteful number, since it uses less digits than its factorization.

12215616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27699831 (or 27699821 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 12215616651 in words is "twelve billion, two hundred fifteen million, six hundred sixteen thousand, six hundred fifty-one".