18036315709 has 16 divisors (see below), whose sum is σ = 18785772720. Its totient is φ = 17295667200.

The previous prime is 18036315707. The next prime is 18036315719. The reversal of 18036315709 is 90751363081.

It can be written as a sum of positive squares in 8 ways, for example, as 560268900 + 17476046809 = 23670^2 + 132197^2 .

It is a cyclic number.

It is not a de Polignac number, because 18036315709 - 2¹ = 18036315707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18036315707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3921199 + ... + 3925795.

It is an arithmetic number, because the mean of its divisors is an integer number (1174110795).

Almost surely, 2^18036315709 is an apocalyptic number.

It is an amenable number.

18036315709 is a deficient number, since it is larger than the sum of its proper divisors (749457011).

18036315709 is a wasteful number, since it uses less digits than its factorization.

18036315709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 18036315709 in words is "eighteen billion, thirty-six million, three hundred fifteen thousand, seven hundred nine".