1218585216 has 64 divisors (see below), whose sum is σ = 3407248800. Its totient is φ = 384814080.

The previous prime is 1218585163. The next prime is 1218585217. The reversal of 1218585216 is 6125858121.

It is a tau number, because it is divible by the number of its divisors (64).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1218585217) 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, 76215 + ... + 90806.

Almost surely, 2^1218585216 is an apocalyptic number.

1218585216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218585216 is an abundant number, since it is smaller than the sum of its proper divisors (2188663584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218585216 is a wasteful number, since it uses less digits than its factorization.

1218585216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167057 (or 167045 counting only the distinct ones).

The product of its digits is 38400, while the sum is 39.

The square root of 1218585216 is about 34908.2399441736. The cubic root of 1218585216 is about 1068.1165270042.

The spelling of 1218585216 in words is "one billion, two hundred eighteen million, five hundred eighty-five thousand, two hundred sixteen".