18015163085 has 4 divisors (see below), whose sum is σ = 21618195708. Its totient is φ = 14412130464.

The previous prime is 18015163079. The next prime is 18015163087. The reversal of 18015163085 is 58036151081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58036151081 = 29 ⋅2001246589.

It can be written as a sum of positive squares in 2 ways, for example, as 12568427881 + 5446735204 = 112109^2 + 73802^2 .

It is a cyclic number.

It is not a de Polignac number, because 18015163085 - 2⁴ = 18015163069 is a prime.

It is a super-2 number, since 2×18015163085² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18015163087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801516304 + ... + 1801516313.

It is an arithmetic number, because the mean of its divisors is an integer number (5404548927).

Almost surely, 2^18015163085 is an apocalyptic number.

It is an amenable number.

18015163085 is a deficient number, since it is larger than the sum of its proper divisors (3603032623).

18015163085 is an equidigital number, since it uses as much as digits as its factorization.

18015163085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603032622.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 18015163085 in words is "eighteen billion, fifteen million, one hundred sixty-three thousand, eighty-five".