18078280066 has 16 divisors (see below), whose sum is σ = 33808731840. Its totient is φ = 7043485680.

The previous prime is 18078280061. The next prime is 18078280069. The reversal of 18078280066 is 66008287081.

It is a junction number, because it is equal to n+sod(n) for n = 18078279998 and 18078280025.

It is not an unprimeable number, because it can be changed into a prime (18078280061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58695561 + ... + 58695868.

It is an arithmetic number, because the mean of its divisors is an integer number (2113045740).

Almost surely, 2^18078280066 is an apocalyptic number.

18078280066 is a deficient number, since it is larger than the sum of its proper divisors (15730451774).

18078280066 is a wasteful number, since it uses less digits than its factorization.

18078280066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117391449.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 18078280066 in words is "eighteen billion, seventy-eight million, two hundred eighty thousand, sixty-six".