78833917691 has 2 divisors, whose sum is σ = 78833917692. Its totient is φ = 78833917690.

The previous prime is 78833917667. The next prime is 78833917717. The reversal of 78833917691 is 19671933887.

It is a weak prime.

It is an emirp because it is prime and its reverse (19671933887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78833917691 - 2¹⁸ = 78833655547 is a prime.

It is a super-2 number, since 2×78833917691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78833917601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39416958845 + 39416958846.

It is an arithmetic number, because the mean of its divisors is an integer number (39416958846).

Almost surely, 2^78833917691 is an apocalyptic number.

78833917691 is a deficient number, since it is larger than the sum of its proper divisors (1).

78833917691 is an equidigital number, since it uses as much as digits as its factorization.

78833917691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 62.

The spelling of 78833917691 in words is "seventy-eight billion, eight hundred thirty-three million, nine hundred seventeen thousand, six hundred ninety-one".