1216819747643 has 8 divisors (see below), whose sum is σ = 1219229771760. Its totient is φ = 1214410700160.

The previous prime is 1216819747601. The next prime is 1216819747673. The reversal of 1216819747643 is 3467479186121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216819747643 - 2⁶ = 1216819747579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216819747673) 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, 2275871 + ... + 2759207.

It is an arithmetic number, because the mean of its divisors is an integer number (152403721470).

Almost surely, 2^{1216819747643} is an apocalyptic number.

1216819747643 is a deficient number, since it is larger than the sum of its proper divisors (2410024117).

1216819747643 is an equidigital number, since it uses as much as digits as its factorization.

1216819747643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488317.

The product of its digits is 12192768, while the sum is 59.

The spelling of 1216819747643 in words is "one trillion, two hundred sixteen billion, eight hundred nineteen million, seven hundred forty-seven thousand, six hundred forty-three".