1818668181 has 16 divisors (see below), whose sum is σ = 2656323648. Its totient is φ = 1097644800.

The previous prime is 1818668147. The next prime is 1818668183.

1818668181 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1818668181 - 2²³ = 1810279573 is a prime.

It is a super-2 number, since 2×1818668181² = 6615107905163697522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1818668181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818668183) 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, 106386 + ... + 122291.

It is an arithmetic number, because the mean of its divisors is an integer number (166020228).

Almost surely, 2^1818668181 is an apocalyptic number.

1818668181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1818668181 is a deficient number, since it is larger than the sum of its proper divisors (837655467).

1818668181 is a wasteful number, since it uses less digits than its factorization.

1818668181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228932.

The product of its digits is 147456, while the sum is 48.

The square root of 1818668181 is about 42645.8459993468. The cubic root of 1818668181 is about 1220.6312645026.

The spelling of 1818668181 in words is "one billion, eight hundred eighteen million, six hundred sixty-eight thousand, one hundred eighty-one".