78340505339 has 2 divisors, whose sum is σ = 78340505340. Its totient is φ = 78340505338.

The previous prime is 78340505303. The next prime is 78340505351. The reversal of 78340505339 is 93350504387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78340505339 is a prime.

It is a super-2 number, since 2×78340505339² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78340505293 and 78340505302.

It is not a weakly prime, because it can be changed into another prime (78340505389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39170252669 + 39170252670.

It is an arithmetic number, because the mean of its divisors is an integer number (39170252670).

Almost surely, 2^78340505339 is an apocalyptic number.

78340505339 is a deficient number, since it is larger than the sum of its proper divisors (1).

78340505339 is an equidigital number, since it uses as much as digits as its factorization.

78340505339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 78340505339 in words is "seventy-eight billion, three hundred forty million, five hundred five thousand, three hundred thirty-nine".