78163794029 has 4 divisors (see below), whose sum is σ = 82761664284. Its totient is φ = 73565923776.

The previous prime is 78163794013. The next prime is 78163794073. The reversal of 78163794029 is 92049736187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92049736187 = 3541 ⋅25995407.

It can be written as a sum of positive squares in 2 ways, for example, as 36477180100 + 41686613929 = 190990^2 + 204173^2 .

It is a cyclic number.

It is not a de Polignac number, because 78163794029 - 2⁴ = 78163794013 is a prime.

It is a super-2 number, since 2×78163794029² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78163794229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2298935102 + ... + 2298935135.

It is an arithmetic number, because the mean of its divisors is an integer number (20690416071).

Almost surely, 2^78163794029 is an apocalyptic number.

It is an amenable number.

78163794029 is a deficient number, since it is larger than the sum of its proper divisors (4597870255).

78163794029 is a wasteful number, since it uses less digits than its factorization.

78163794029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597870254.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 78163794029 in words is "seventy-eight billion, one hundred sixty-three million, seven hundred ninety-four thousand, twenty-nine".