18042780722 has 18 divisors (see below), whose sum is σ = 28569286143. Its totient is φ = 8544870684.

The previous prime is 18042780719. The next prime is 18042780739. The reversal of 18042780722 is 22708724081.

It can be written as a sum of positive squares in only one way, i.e., 9021390361 + 9021390361 = 94981^2 + 94981^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=94981.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18042780722.

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 8 ways as a sum of consecutive naturals, for example, 3606779 + ... + 3611777.

Almost surely, 2^18042780722 is an apocalyptic number.

18042780722 is a deficient number, since it is larger than the sum of its proper divisors (10526505421).

18042780722 is an frugal number, since it uses more digits than its factorization.

18042780722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038 (or 5020 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 18042780722 in words is "eighteen billion, forty-two million, seven hundred eighty thousand, seven hundred twenty-two".