1216345403773 has 4 divisors (see below), whose sum is σ = 1216349484480. Its totient is φ = 1216341323068.

The previous prime is 1216345403729. The next prime is 1216345403797. The reversal of 1216345403773 is 3773045436121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216345403773 - 2²⁵ = 1216311849341 is a prime.

It is a super-2 number, since 2×1216345403773² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216345403873) 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, 1554715 + ... + 2202232.

It is an arithmetic number, because the mean of its divisors is an integer number (304087371120).

Almost surely, 2^{1216345403773} is an apocalyptic number.

It is an amenable number.

1216345403773 is a deficient number, since it is larger than the sum of its proper divisors (4080707).

1216345403773 is an equidigital number, since it uses as much as digits as its factorization.

1216345403773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080706.

The product of its (nonzero) digits is 1270080, while the sum is 46.

The spelling of 1216345403773 in words is "one trillion, two hundred sixteen billion, three hundred forty-five million, four hundred three thousand, seven hundred seventy-three".