1216736806771 has 8 divisors (see below), whose sum is σ = 1217354987888. Its totient is φ = 1216118772000.

The previous prime is 1216736806657. The next prime is 1216736806799. The reversal of 1216736806771 is 1776086376121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216736806771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216739806771) 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, 19044901 + ... + 19108681.

It is an arithmetic number, because the mean of its divisors is an integer number (152169373486).

Almost surely, 2^{1216736806771} is an apocalyptic number.

1216736806771 is a deficient number, since it is larger than the sum of its proper divisors (618181117).

1216736806771 is an equidigital number, since it uses as much as digits as its factorization.

1216736806771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73173.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 1216736806771 in words is "one trillion, two hundred sixteen billion, seven hundred thirty-six million, eight hundred six thousand, seven hundred seventy-one".