12018381065 has 4 divisors (see below), whose sum is σ = 14422057284. Its totient is φ = 9614704848.

The previous prime is 12018381043. The next prime is 12018381073. The reversal of 12018381065 is 56018381021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56018381021 = 43 ⋅1302753047.

It can be written as a sum of positive squares in 2 ways, for example, as 1212362761 + 10806018304 = 34819^2 + 103952^2 .

It is a cyclic number.

It is not a de Polignac number, because 12018381065 - 2¹² = 12018376969 is a prime.

It is a super-3 number, since 3×12018381065³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

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, 1201838102 + ... + 1201838111.

It is an arithmetic number, because the mean of its divisors is an integer number (3605514321).

Almost surely, 2^12018381065 is an apocalyptic number.

It is an amenable number.

12018381065 is a deficient number, since it is larger than the sum of its proper divisors (2403676219).

12018381065 is an equidigital number, since it uses as much as digits as its factorization.

12018381065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403676218.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 12018381065 in words is "twelve billion, eighteen million, three hundred eighty-one thousand, sixty-five".