78819194231 has 4 divisors (see below), whose sum is σ = 80652198792. Its totient is φ = 76986189672.

The previous prime is 78819194219. The next prime is 78819194263. The reversal of 78819194231 is 13249191887.

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

It is not a de Polignac number, because 78819194231 - 2¹⁰ = 78819193207 is a prime.

It is a super-2 number, since 2×78819194231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78819194291) 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, 916502216 + ... + 916502301.

It is an arithmetic number, because the mean of its divisors is an integer number (20163049698).

Almost surely, 2^78819194231 is an apocalyptic number.

78819194231 is a deficient number, since it is larger than the sum of its proper divisors (1833004561).

78819194231 is a wasteful number, since it uses less digits than its factorization.

78819194231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833004560.

The product of its digits is 870912, while the sum is 53.

The spelling of 78819194231 in words is "seventy-eight billion, eight hundred nineteen million, one hundred ninety-four thousand, two hundred thirty-one".