1818133805 has 6 divisors (see below), whose sum is σ = 2181874986. Its totient is φ = 1454430768.

The previous prime is 1818133753. The next prime is 1818133813. The reversal of 1818133805 is 5083318181.

It can be written as a sum of positive squares in 3 ways, for example, as 1343808964 + 474324841 = 36658^2 + 21779^2 .

It is not a de Polignac number, because 1818133805 - 2⁸ = 1818133549 is a prime.

It is a super-2 number, since 2×1818133805² = 6611221065767556050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85811 + ... + 104879.

It is an arithmetic number, because the mean of its divisors is an integer number (363645831).

Almost surely, 2^1818133805 is an apocalyptic number.

It is an amenable number.

1818133805 is a deficient number, since it is larger than the sum of its proper divisors (363741181).

1818133805 is an frugal number, since it uses more digits than its factorization.

1818133805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38143 (or 19074 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1818133805 is about 42639.5802629435. The cubic root of 1818133805 is about 1220.5117008286.

The spelling of 1818133805 in words is "one billion, eight hundred eighteen million, one hundred thirty-three thousand, eight hundred five".