78163199987 has 2 divisors, whose sum is σ = 78163199988. Its totient is φ = 78163199986.

The previous prime is 78163199971. The next prime is 78163200043. The reversal of 78163199987 is 78999136187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78163199987 - 2⁴ = 78163199971 is a prime.

It is a super-2 number, since 2×78163199987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78163199087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081599993 + 39081599994.

It is an arithmetic number, because the mean of its divisors is an integer number (39081599994).

Almost surely, 2^78163199987 is an apocalyptic number.

78163199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

78163199987 is an equidigital number, since it uses as much as digits as its factorization.

78163199987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 68.

The spelling of 78163199987 in words is "seventy-eight billion, one hundred sixty-three million, one hundred ninety-nine thousand, nine hundred eighty-seven".