78334812173 has 4 divisors (see below), whose sum is σ = 78346037088. Its totient is φ = 78323587260.

The previous prime is 78334812133. The next prime is 78334812197. The reversal of 78334812173 is 37121843387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78334812173 - 2⁸ = 78334811917 is a prime.

It is a super-2 number, since 2×78334812173² (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 (78334812103) 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, 5601983 + ... + 5615948.

It is an arithmetic number, because the mean of its divisors is an integer number (19586509272).

Almost surely, 2^78334812173 is an apocalyptic number.

It is an amenable number.

78334812173 is a deficient number, since it is larger than the sum of its proper divisors (11224915).

78334812173 is a wasteful number, since it uses less digits than its factorization.

78334812173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11224914.

The product of its digits is 677376, while the sum is 47.

The spelling of 78334812173 in words is "seventy-eight billion, three hundred thirty-four million, eight hundred twelve thousand, one hundred seventy-three".