78445338199 has 2 divisors, whose sum is σ = 78445338200. Its totient is φ = 78445338198.

The previous prime is 78445338197. The next prime is 78445338281. The reversal of 78445338199 is 99183354487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78445338199 - 2¹ = 78445338197 is a prime.

Together with 78445338197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78445338197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39222669099 + 39222669100.

It is an arithmetic number, because the mean of its divisors is an integer number (39222669100).

Almost surely, 2^78445338199 is an apocalyptic number.

78445338199 is a deficient number, since it is larger than the sum of its proper divisors (1).

78445338199 is an equidigital number, since it uses as much as digits as its factorization.

78445338199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 61.

The spelling of 78445338199 in words is "seventy-eight billion, four hundred forty-five million, three hundred thirty-eight thousand, one hundred ninety-nine".