78112292179 has 4 divisors (see below), whose sum is σ = 78115067280. Its totient is φ = 78109517080.

The previous prime is 78112292173. The next prime is 78112292201. The reversal of 78112292179 is 97129221187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97129221187 = 19 ⋅5112064273.

It is a cyclic number.

It is not a de Polignac number, because 78112292179 - 2³ = 78112292171 is a prime.

It is a super-2 number, since 2×78112292179² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78112292171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344892 + ... + 1401769.

It is an arithmetic number, because the mean of its divisors is an integer number (19528766820).

Almost surely, 2^78112292179 is an apocalyptic number.

78112292179 is a deficient number, since it is larger than the sum of its proper divisors (2775101).

78112292179 is a wasteful number, since it uses less digits than its factorization.

78112292179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775100.

The product of its digits is 254016, while the sum is 49.

The spelling of 78112292179 in words is "seventy-eight billion, one hundred twelve million, two hundred ninety-two thousand, one hundred seventy-nine".