18354723844 has 6 divisors (see below), whose sum is σ = 32120766734. Its totient is φ = 9177361920.

The previous prime is 18354723841. The next prime is 18354723859. The reversal of 18354723844 is 44832745381.

It can be written as a sum of positive squares in only one way, i.e., 17765690944 + 589032900 = 133288^2 + 24270^2 .

It is not an unprimeable number, because it can be changed into a prime (18354723841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2294340477 + ... + 2294340484.

Almost surely, 2^18354723844 is an apocalyptic number.

It is an amenable number.

18354723844 is a deficient number, since it is larger than the sum of its proper divisors (13766042890).

18354723844 is a wasteful number, since it uses less digits than its factorization.

18354723844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588680965 (or 4588680963 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 49.

The spelling of 18354723844 in words is "eighteen billion, three hundred fifty-four million, seven hundred twenty-three thousand, eight hundred forty-four".