78559278623989 has 2 divisors, whose sum is σ = 78559278623990. Its totient is φ = 78559278623988.

The previous prime is 78559278623981. The next prime is 78559278624011. The reversal of 78559278623989 is 98932687295587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75853944479889 + 2705334144100 = 8709417^2 + 1644790^2 .

It is a cyclic number.

It is not a de Polignac number, because 78559278623989 - 2³ = 78559278623981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78559278623981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39279639311994 + 39279639311995.

It is an arithmetic number, because the mean of its divisors is an integer number (39279639311995).

Almost surely, 2^{78559278623989} is an apocalyptic number.

It is an amenable number.

78559278623989 is a deficient number, since it is larger than the sum of its proper divisors (1).

78559278623989 is an equidigital number, since it uses as much as digits as its factorization.

78559278623989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32920473600, while the sum is 88.

The spelling of 78559278623989 in words is "seventy-eight trillion, five hundred fifty-nine billion, two hundred seventy-eight million, six hundred twenty-three thousand, nine hundred eighty-nine".