78999039499 has 2 divisors, whose sum is σ = 78999039500. Its totient is φ = 78999039498.

The previous prime is 78999039467. The next prime is 78999039517. The reversal of 78999039499 is 99493099987.

It is a strong prime.

It is an emirp because it is prime and its reverse (99493099987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78999039499 - 2⁵ = 78999039467 is a prime.

It is not a weakly prime, because it can be changed into another prime (78999039419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39499519749 + 39499519750.

It is an arithmetic number, because the mean of its divisors is an integer number (39499519750).

Almost surely, 2^78999039499 is an apocalyptic number.

78999039499 is a deficient number, since it is larger than the sum of its proper divisors (1).

78999039499 is an equidigital number, since it uses as much as digits as its factorization.

78999039499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 357128352, while the sum is 76.

The spelling of 78999039499 in words is "seventy-eight billion, nine hundred ninety-nine million, thirty-nine thousand, four hundred ninety-nine".