1216364511603 has 4 divisors (see below), whose sum is σ = 1621819348808. Its totient is φ = 810909674400.

The previous prime is 1216364511587. The next prime is 1216364511619. The reversal of 1216364511603 is 3061154636121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1216364511587) and next prime (1216364511619).

It is not a de Polignac number, because 1216364511603 - 2⁴ = 1216364511587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216364511403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202727418598 + ... + 202727418603.

It is an arithmetic number, because the mean of its divisors is an integer number (405454837202).

Almost surely, 2^{1216364511603} is an apocalyptic number.

1216364511603 is a deficient number, since it is larger than the sum of its proper divisors (405454837205).

1216364511603 is an equidigital number, since it uses as much as digits as its factorization.

1216364511603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405454837204.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 1216364511603 in words is "one trillion, two hundred sixteen billion, three hundred sixty-four million, five hundred eleven thousand, six hundred three".