78795618218 has 4 divisors (see below), whose sum is σ = 118193427330. Its totient is φ = 39397809108.

The previous prime is 78795618197. The next prime is 78795618221. The reversal of 78795618218 is 81281659787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81281659787 = 41 ⋅1982479507.

It can be written as a sum of positive squares in only one way, i.e., 61099435489 + 17696182729 = 247183^2 + 133027^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19698904553 + ... + 19698904556.

Almost surely, 2^78795618218 is an apocalyptic number.

78795618218 is a deficient number, since it is larger than the sum of its proper divisors (39397809112).

78795618218 is a wasteful number, since it uses less digits than its factorization.

78795618218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39397809111.

The product of its digits is 13547520, while the sum is 62.

The spelling of 78795618218 in words is "seventy-eight billion, seven hundred ninety-five million, six hundred eighteen thousand, two hundred eighteen".