2122616779691 has 2 divisors, whose sum is σ = 2122616779692. Its totient is φ = 2122616779690.

The previous prime is 2122616779637. The next prime is 2122616779693. The reversal of 2122616779691 is 1969776162212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122616779691 is a prime.

Together with 2122616779693, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2122616779691.

It is not a weakly prime, because it can be changed into another prime (2122616779693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061308389845 + 1061308389846.

It is an arithmetic number, because the mean of its divisors is an integer number (1061308389846).

Almost surely, 2^{2122616779691} is an apocalyptic number.

2122616779691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122616779691 is an equidigital number, since it uses as much as digits as its factorization.

2122616779691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 59.

The spelling of 2122616779691 in words is "two trillion, one hundred twenty-two billion, six hundred sixteen million, seven hundred seventy-nine thousand, six hundred ninety-one".