12218451555 has 16 divisors (see below), whose sum is σ = 19574831520. Its totient is φ = 6508071168.

The previous prime is 12218451551. The next prime is 12218451607. The reversal of 12218451555 is 55515481221.

It is not a de Polignac number, because 12218451555 - 2² = 12218451551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12218451551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515290 + ... + 538479.

It is an arithmetic number, because the mean of its divisors is an integer number (1223426970).

Almost surely, 2^12218451555 is an apocalyptic number.

12218451555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12218451555 is a deficient number, since it is larger than the sum of its proper divisors (7356379965).

12218451555 is a wasteful number, since it uses less digits than its factorization.

12218451555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054550.

The product of its digits is 80000, while the sum is 39.

The spelling of 12218451555 in words is "twelve billion, two hundred eighteen million, four hundred fifty-one thousand, five hundred fifty-five".