1218444865906 has 16 divisors (see below), whose sum is σ = 1828404246816. Its totient is φ = 608976842656.

The previous prime is 1218444865873. The next prime is 1218444865909. The reversal of 1218444865906 is 6095684448121.

It is not an unprimeable number, because it can be changed into a prime (1218444865909) 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, 69948510 + ... + 69965926.

It is an arithmetic number, because the mean of its divisors is an integer number (114275265426).

Almost surely, 2^{1218444865906} is an apocalyptic number.

1218444865906 is a deficient number, since it is larger than the sum of its proper divisors (609959380910).

1218444865906 is a wasteful number, since it uses less digits than its factorization.

1218444865906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29513.

The product of its (nonzero) digits is 13271040, while the sum is 58.

The spelling of 1218444865906 in words is "one trillion, two hundred eighteen billion, four hundred forty-four million, eight hundred sixty-five thousand, nine hundred six".