1216942162691 has 8 divisors (see below), whose sum is σ = 1219271021760. Its totient is φ = 1214613684648.

The previous prime is 1216942162669. The next prime is 1216942162729. The reversal of 1216942162691 is 1962612496121.

It is a happy number.

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-1216942162691 is a prime.

It is a super-2 number, since 2×1216942162691² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216942161691) 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, 6770120 + ... + 6947546.

It is an arithmetic number, because the mean of its divisors is an integer number (152408877720).

Almost surely, 2^{1216942162691} is an apocalyptic number.

1216942162691 is a deficient number, since it is larger than the sum of its proper divisors (2328859069).

1216942162691 is a wasteful number, since it uses less digits than its factorization.

1216942162691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190513.

The product of its digits is 559872, while the sum is 50.

The spelling of 1216942162691 in words is "one trillion, two hundred sixteen billion, nine hundred forty-two million, one hundred sixty-two thousand, six hundred ninety-one".