18000000002 has 4 divisors (see below), whose sum is σ = 27000000006. Its totient is φ = 9000000000.

The previous prime is 18000000001. The next prime is 18000000013. The reversal of 18000000002 is 20000000081.

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., 17205831241 + 794168761 = 131171^2 + 28181^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18000000002.

It is not an unprimeable number, because it can be changed into a prime (18000000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499999999 + ... + 4500000002.

Almost surely, 2^18000000002 is an apocalyptic number.

18000000002 is a deficient number, since it is larger than the sum of its proper divisors (9000000004).

18000000002 is an equidigital number, since it uses as much as digits as its factorization.

18000000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000000003.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 18000000002 its reverse (20000000081), we get a palindrome (38000000083).

It can be divided in two parts, 1800000000 and 2, that multiplied together give a square (3600000000 = 60000²).

The spelling of 18000000002 in words is "eighteen billion, two", and thus it is an aban number and an uban number.