78680000017 has 2 divisors, whose sum is σ = 78680000018. Its totient is φ = 78680000016.

The previous prime is 78679999973. The next prime is 78680000023. The reversal of 78680000017 is 71000008687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76512538881 + 2167461136 = 276609^2 + 46556^2 .

It is an emirp because it is prime and its reverse (71000008687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78680000017 - 2³⁵ = 44320261649 is a prime.

It is not a weakly prime, because it can be changed into another prime (78680000417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39340000008 + 39340000009.

It is an arithmetic number, because the mean of its divisors is an integer number (39340000009).

Almost surely, 2^78680000017 is an apocalyptic number.

It is an amenable number.

78680000017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78680000017 is an equidigital number, since it uses as much as digits as its factorization.

78680000017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 78680000017 in words is "seventy-eight billion, six hundred eighty million, seventeen", and thus it is an aban number.