78717772218 has 8 divisors (see below), whose sum is σ = 157435544448. Its totient is φ = 26239257404.

The previous prime is 78717772201. The next prime is 78717772219. The reversal of 78717772218 is 81227771787.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

78717772218 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (78717772219) 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, 6559814346 + ... + 6559814357.

It is an arithmetic number, because the mean of its divisors is an integer number (19679443056).

Almost surely, 2^78717772218 is an apocalyptic number.

78717772218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78717772218 is a wasteful number, since it uses less digits than its factorization.

78717772218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13119628708.

The product of its digits is 4302592, while the sum is 57.

The spelling of 78717772218 in words is "seventy-eight billion, seven hundred seventeen million, seven hundred seventy-two thousand, two hundred eighteen".