78218658681418 has 32 divisors (see below), whose sum is σ = 121504892095440. Its totient is φ = 37741300546560.

The previous prime is 78218658681377. The next prime is 78218658681419. The reversal of 78218658681418 is 81418685681287.

It can be written as a sum of positive squares in 8 ways, for example, as 53002724408209 + 25215934273209 = 7280297^2 + 5021547^2 .

It is a super-2 number, since 2×78218658681418² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78218658681419) 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 15 ways as a sum of consecutive naturals, for example, 255700296 + ... + 256006012.

Almost surely, 2^{78218658681418} is an apocalyptic number.

78218658681418 is a deficient number, since it is larger than the sum of its proper divisors (43286233414022).

78218658681418 is a wasteful number, since it uses less digits than its factorization.

78218658681418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345402.

The product of its digits is 330301440, while the sum is 73.

The spelling of 78218658681418 in words is "seventy-eight trillion, two hundred eighteen billion, six hundred fifty-eight million, six hundred eighty-one thousand, four hundred eighteen".