1216165806303 has 16 divisors (see below), whose sum is σ = 1853226935040. Its totient is φ = 694943678016.

The previous prime is 1216165806299. The next prime is 1216165806319. The reversal of 1216165806303 is 3036085616121.

It is not a de Polignac number, because 1216165806303 - 2² = 1216165806299 is a prime.

It is a super-2 number, since 2×1216165806303² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216165806803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1785051 + ... + 2370387.

It is an arithmetic number, because the mean of its divisors is an integer number (115826683440).

Almost surely, 2^{1216165806303} is an apocalyptic number.

1216165806303 is a deficient number, since it is larger than the sum of its proper divisors (637061128737).

1216165806303 is an equidigital number, since it uses as much as digits as its factorization.

1216165806303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684286.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 1216165806303 in words is "one trillion, two hundred sixteen billion, one hundred sixty-five million, eight hundred six thousand, three hundred three".