12218236604415 has 40 divisors (see below), whose sum is σ = 22368327284160. Its totient is φ = 6377746189248.

The previous prime is 12218236604411. The next prime is 12218236604423. The reversal of 12218236604415 is 51440663281221.

12218236604415 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 8 + 2 + 36 + 604 + 4 + 1 + 5 = 666.

It is not a de Polignac number, because 12218236604415 - 2² = 12218236604411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218236604411) 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, 320922300 + ... + 320960369.

It is an arithmetic number, because the mean of its divisors is an integer number (559208182104).

Almost surely, 2^{12218236604415} is an apocalyptic number.

12218236604415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12218236604415 is a deficient number, since it is larger than the sum of its proper divisors (10150090679745).

12218236604415 is an equidigital number, since it uses as much as digits as its factorization.

12218236604415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641882733 (or 641882724 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

Adding to 12218236604415 its reverse (51440663281221), we get a palindrome (63658899885636).

The spelling of 12218236604415 in words is "twelve trillion, two hundred eighteen billion, two hundred thirty-six million, six hundred four thousand, four hundred fifteen".