1218680855 has 8 divisors (see below), whose sum is σ = 1671333792. Its totient is φ = 835666848.

The previous prime is 1218680839. The next prime is 1218680861. The reversal of 1218680855 is 5580868121.

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

It is a cyclic number.

It is not a de Polignac number, because 1218680855 - 2⁴ = 1218680839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17409692 + ... + 17409761.

It is an arithmetic number, because the mean of its divisors is an integer number (208916724).

Almost surely, 2^1218680855 is an apocalyptic number.

1218680855 is a deficient number, since it is larger than the sum of its proper divisors (452652937).

1218680855 is an equidigital number, since it uses as much as digits as its factorization.

1218680855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34819465.

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 1218680855 is about 34909.6097801164. The cubic root of 1218680855 is about 1068.1444694965.

The spelling of 1218680855 in words is "one billion, two hundred eighteen million, six hundred eighty thousand, eight hundred fifty-five".