816784108979 has 2 divisors, whose sum is σ = 816784108980. Its totient is φ = 816784108978.

The previous prime is 816784108957. The next prime is 816784108981. The reversal of 816784108979 is 979801487618.

816784108979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816784108979 is a prime.

Together with 816784108981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (816784108939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408392054489 + 408392054490.

It is an arithmetic number, because the mean of its divisors is an integer number (408392054490).

Almost surely, 2^816784108979 is an apocalyptic number.

816784108979 is a deficient number, since it is larger than the sum of its proper divisors (1).

816784108979 is an equidigital number, since it uses as much as digits as its factorization.

816784108979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48771072, while the sum is 68.

The spelling of 816784108979 in words is "eight hundred sixteen billion, seven hundred eighty-four million, one hundred eight thousand, nine hundred seventy-nine".