18143281811 has 16 divisors (see below), whose sum is σ = 19577469600. Its totient is φ = 16762318848.

The previous prime is 18143281781. The next prime is 18143281837. The reversal of 18143281811 is 11818234181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18143281811 - 2²² = 18139087507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18143284811) 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, 49955 + ... + 196931.

It is an arithmetic number, because the mean of its divisors is an integer number (1223591850).

Almost surely, 2^18143281811 is an apocalyptic number.

18143281811 is a deficient number, since it is larger than the sum of its proper divisors (1434187789).

18143281811 is a wasteful number, since it uses less digits than its factorization.

18143281811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147158.

The product of its digits is 12288, while the sum is 38.

The spelling of 18143281811 in words is "eighteen billion, one hundred forty-three million, two hundred eighty-one thousand, eight hundred eleven".