78668198319 has 4 divisors (see below), whose sum is σ = 104890931096. Its totient is φ = 52445465544.

The previous prime is 78668198251. The next prime is 78668198381. The reversal of 78668198319 is 91389186687.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78668198319 - 2¹⁵ = 78668165551 is a prime.

It is a super-2 number, since 2×78668198319² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78668198319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668196319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13111366384 + ... + 13111366389.

It is an arithmetic number, because the mean of its divisors is an integer number (26222732774).

Almost surely, 2^78668198319 is an apocalyptic number.

78668198319 is a deficient number, since it is larger than the sum of its proper divisors (26222732777).

78668198319 is a wasteful number, since it uses less digits than its factorization.

78668198319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26222732776.

The product of its digits is 31352832, while the sum is 66.

The spelling of 78668198319 in words is "seventy-eight billion, six hundred sixty-eight million, one hundred ninety-eight thousand, three hundred nineteen".