78236063291 has 2 divisors, whose sum is σ = 78236063292. Its totient is φ = 78236063290.

The previous prime is 78236063263. The next prime is 78236063303. The reversal of 78236063291 is 19236063287.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78236063291 - 2²⁶ = 78168954427 is a prime.

It is a super-2 number, since 2×78236063291² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78236063891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39118031645 + 39118031646.

It is an arithmetic number, because the mean of its divisors is an integer number (39118031646).

Almost surely, 2^78236063291 is an apocalyptic number.

78236063291 is a deficient number, since it is larger than the sum of its proper divisors (1).

78236063291 is an equidigital number, since it uses as much as digits as its factorization.

78236063291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 78236063291 in words is "seventy-eight billion, two hundred thirty-six million, sixty-three thousand, two hundred ninety-one".