18307749338 has 4 divisors (see below), whose sum is σ = 27461624010. Its totient is φ = 9153874668.

The previous prime is 18307749337. The next prime is 18307749367. The reversal of 18307749338 is 83394770381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13749204049 + 4558545289 = 117257^2 + 67517^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18307749338.

It is not an unprimeable number, because it can be changed into a prime (18307749331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4576937333 + ... + 4576937336.

Almost surely, 2^18307749338 is an apocalyptic number.

18307749338 is a deficient number, since it is larger than the sum of its proper divisors (9153874672).

18307749338 is an equidigital number, since it uses as much as digits as its factorization.

18307749338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9153874671.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 18307749338 in words is "eighteen billion, three hundred seven million, seven hundred forty-nine thousand, three hundred thirty-eight".