78178686833 has 16 divisors (see below), whose sum is σ = 84608326656. Its totient is φ = 71808759360.

The previous prime is 78178686829. The next prime is 78178686841. The reversal of 78178686833 is 33868687187.

It is not a de Polignac number, because 78178686833 - 2² = 78178686829 is a prime.

It is a super-2 number, since 2×78178686833² (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 78178686833.

It is not an unprimeable number, because it can be changed into a prime (78178686893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8364743 + ... + 8374083.

It is an arithmetic number, because the mean of its divisors is an integer number (5288020416).

Almost surely, 2^78178686833 is an apocalyptic number.

It is an amenable number.

78178686833 is a deficient number, since it is larger than the sum of its proper divisors (6429639823).

78178686833 is a wasteful number, since it uses less digits than its factorization.

78178686833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12464.

The product of its digits is 65028096, while the sum is 65.

The spelling of 78178686833 in words is "seventy-eight billion, one hundred seventy-eight million, six hundred eighty-six thousand, eight hundred thirty-three".