78663236230639 has 2 divisors, whose sum is σ = 78663236230640. Its totient is φ = 78663236230638.

The previous prime is 78663236230633. The next prime is 78663236230679. The reversal of 78663236230639 is 93603263236687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78663236230639 - 2³⁷ = 78525797277167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78663236230633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39331618115319 + 39331618115320.

It is an arithmetic number, because the mean of its divisors is an integer number (39331618115320).

Almost surely, 2^{78663236230639} is an apocalyptic number.

78663236230639 is a deficient number, since it is larger than the sum of its proper divisors (1).

78663236230639 is an equidigital number, since it uses as much as digits as its factorization.

78663236230639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211631616, while the sum is 64.

The spelling of 78663236230639 in words is "seventy-eight trillion, six hundred sixty-three billion, two hundred thirty-six million, two hundred thirty thousand, six hundred thirty-nine".