78120701818 has 8 divisors (see below), whose sum is σ = 119392016148. Its totient is φ = 38323363104.

The previous prime is 78120701753. The next prime is 78120701821. The reversal of 78120701818 is 81810702187.

It can be written as a sum of positive squares in 2 ways, for example, as 68443454689 + 9677247129 = 261617^2 + 98373^2 .

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

It is a super-2 number, since 2×78120701818² (a number of 23 digits) contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 368493771 + ... + 368493982.

Almost surely, 2^78120701818 is an apocalyptic number.

78120701818 is a deficient number, since it is larger than the sum of its proper divisors (41271314330).

78120701818 is a wasteful number, since it uses less digits than its factorization.

78120701818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736987808.

The product of its (nonzero) digits is 50176, while the sum is 43.

The spelling of 78120701818 in words is "seventy-eight billion, one hundred twenty million, seven hundred one thousand, eight hundred eighteen".