1218355585 has 16 divisors (see below), whose sum is σ = 1481650560. Its totient is φ = 961672320.

The previous prime is 1218355559. The next prime is 1218355613. The reversal of 1218355585 is 5855538121.

It is not a de Polignac number, because 1218355585 - 2⁵ = 1218355553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140506 + ... + 148924.

It is an arithmetic number, because the mean of its divisors is an integer number (92603160).

Almost surely, 2^1218355585 is an apocalyptic number.

It is an amenable number.

1218355585 is a deficient number, since it is larger than the sum of its proper divisors (263294975).

1218355585 is a wasteful number, since it uses less digits than its factorization.

1218355585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808.

The product of its digits is 240000, while the sum is 43.

The square root of 1218355585 is about 34904.9507233573. The cubic root of 1218355585 is about 1068.0494305957.

The spelling of 1218355585 in words is "one billion, two hundred eighteen million, three hundred fifty-five thousand, five hundred eighty-five".