1818156668 has 12 divisors (see below), whose sum is σ = 3183381432. Its totient is φ = 908619120.

The previous prime is 1818156661. The next prime is 1818156671. The reversal of 1818156668 is 8666518181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818156661) 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, 105818 + ... + 121793.

It is an arithmetic number, because the mean of its divisors is an integer number (265281786).

Almost surely, 2^1818156668 is an apocalyptic number.

It is an amenable number.

1818156668 is a deficient number, since it is larger than the sum of its proper divisors (1365224764).

1818156668 is a wasteful number, since it uses less digits than its factorization.

1818156668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229612 (or 229610 counting only the distinct ones).

The product of its digits is 552960, while the sum is 50.

The square root of 1818156668 is about 42639.8483580793. The cubic root of 1818156668 is about 1220.5168167781.

The spelling of 1818156668 in words is "one billion, eight hundred eighteen million, one hundred fifty-six thousand, six hundred sixty-eight".