18001316516 has 12 divisors (see below), whose sum is σ = 32353717788. Its totient is φ = 8757397152.

The previous prime is 18001316503. The next prime is 18001316533. The reversal of 18001316516 is 61561310081.

It can be written as a sum of positive squares in 2 ways, for example, as 9515222116 + 8486094400 = 97546^2 + 92120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60815111 + ... + 60815406.

It is an arithmetic number, because the mean of its divisors is an integer number (2696143149).

Almost surely, 2^18001316516 is an apocalyptic number.

It is an amenable number.

18001316516 is a deficient number, since it is larger than the sum of its proper divisors (14352401272).

18001316516 is a wasteful number, since it uses less digits than its factorization.

18001316516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121630558 (or 121630556 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 18001316516 its reverse (61561310081), we get a palindrome (79562626597).

The spelling of 18001316516 in words is "eighteen billion, one million, three hundred sixteen thousand, five hundred sixteen".