78021918018 has 24 divisors (see below), whose sum is σ = 184415443056. Its totient is φ = 23643005400.

The previous prime is 78021918011. The next prime is 78021918059. The reversal of 78021918018 is 81081912087.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78021918011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197024848 + ... + 197025243.

It is an arithmetic number, because the mean of its divisors is an integer number (7683976794).

Almost surely, 2^78021918018 is an apocalyptic number.

78021918018 is an abundant number, since it is smaller than the sum of its proper divisors (106393525038).

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

78021918018 is a wasteful number, since it uses less digits than its factorization.

78021918018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394050110 (or 394050107 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The spelling of 78021918018 in words is "seventy-eight billion, twenty-one million, nine hundred eighteen thousand, eighteen".