78006306817 has 2 divisors, whose sum is σ = 78006306818. Its totient is φ = 78006306816.

The previous prime is 78006306793. The next prime is 78006306877. The reversal of 78006306817 is 71860360087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40642963201 + 37363343616 = 201601^2 + 193296^2 .

It is a cyclic number.

It is not a de Polignac number, because 78006306817 - 2²⁷ = 77872089089 is a prime.

It is not a weakly prime, because it can be changed into another prime (78006306877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39003153408 + 39003153409.

It is an arithmetic number, because the mean of its divisors is an integer number (39003153409).

Almost surely, 2^78006306817 is an apocalyptic number.

It is an amenable number.

78006306817 is a deficient number, since it is larger than the sum of its proper divisors (1).

78006306817 is an equidigital number, since it uses as much as digits as its factorization.

78006306817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 78006306817 in words is "seventy-eight billion, six million, three hundred six thousand, eight hundred seventeen".