78373484209 has 2 divisors, whose sum is σ = 78373484210. Its totient is φ = 78373484208.

The previous prime is 78373484159. The next prime is 78373484221. The reversal of 78373484209 is 90248437387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66866202225 + 11507281984 = 258585^2 + 107272^2 .

It is a cyclic number.

It is not a de Polignac number, because 78373484209 - 2⁹ = 78373483697 is a prime.

It is a super-2 number, since 2×78373484209² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78373484209.

It is not a weakly prime, because it can be changed into another prime (78373484309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39186742104 + 39186742105.

It is an arithmetic number, because the mean of its divisors is an integer number (39186742105).

Almost surely, 2^78373484209 is an apocalyptic number.

It is an amenable number.

78373484209 is a deficient number, since it is larger than the sum of its proper divisors (1).

78373484209 is an equidigital number, since it uses as much as digits as its factorization.

78373484209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 78373484209 in words is "seventy-eight billion, three hundred seventy-three million, four hundred eighty-four thousand, two hundred nine".