12618378555 has 8 divisors (see below), whose sum is σ = 20189405712. Its totient is φ = 6729801888.

The previous prime is 12618378547. The next prime is 12618378559. The reversal of 12618378555 is 55587381621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12618378555 - 2³ = 12618378547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12618378498 and 12618378507.

It is not an unprimeable number, because it can be changed into a prime (12618378559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420612604 + ... + 420612633.

It is an arithmetic number, because the mean of its divisors is an integer number (2523675714).

Almost surely, 2^12618378555 is an apocalyptic number.

12618378555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12618378555 is a deficient number, since it is larger than the sum of its proper divisors (7571027157).

12618378555 is an equidigital number, since it uses as much as digits as its factorization.

12618378555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841225245.

The product of its digits is 2016000, while the sum is 51.

The spelling of 12618378555 in words is "twelve billion, six hundred eighteen million, three hundred seventy-eight thousand, five hundred fifty-five".