18042726668 has 6 divisors (see below), whose sum is σ = 31574771676. Its totient is φ = 9021363332.

The previous prime is 18042726661. The next prime is 18042726673. The reversal of 18042726668 is 86662724081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18042726661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255340830 + ... + 2255340837.

It is an arithmetic number, because the mean of its divisors is an integer number (5262461946).

Almost surely, 2^18042726668 is an apocalyptic number.

It is an amenable number.

18042726668 is a deficient number, since it is larger than the sum of its proper divisors (13532045008).

18042726668 is a wasteful number, since it uses less digits than its factorization.

18042726668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510681671 (or 4510681669 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 18042726668 in words is "eighteen billion, forty-two million, seven hundred twenty-six thousand, six hundred sixty-eight".