78423984311 has 2 divisors, whose sum is σ = 78423984312. Its totient is φ = 78423984310.

The previous prime is 78423984283. The next prime is 78423984371. The reversal of 78423984311 is 11348932487.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78423984311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78423984311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78423984371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39211992155 + 39211992156.

It is an arithmetic number, because the mean of its divisors is an integer number (39211992156).

Almost surely, 2^78423984311 is an apocalyptic number.

78423984311 is a deficient number, since it is larger than the sum of its proper divisors (1).

78423984311 is an equidigital number, since it uses as much as digits as its factorization.

78423984311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The spelling of 78423984311 in words is "seventy-eight billion, four hundred twenty-three million, nine hundred eighty-four thousand, three hundred eleven".