18818371666 has 8 divisors (see below), whose sum is σ = 29713218480. Its totient is φ = 8913965508.

The previous prime is 18818371591. The next prime is 18818371667. The reversal of 18818371666 is 66617381881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18818371666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18818371667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247610116 + ... + 247610191.

It is an arithmetic number, because the mean of its divisors is an integer number (3714152310).

Almost surely, 2^18818371666 is an apocalyptic number.

18818371666 is a deficient number, since it is larger than the sum of its proper divisors (10894846814).

18818371666 is a wasteful number, since it uses less digits than its factorization.

18818371666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495220328.

The product of its digits is 2322432, while the sum is 55.

The spelling of 18818371666 in words is "eighteen billion, eight hundred eighteen million, three hundred seventy-one thousand, six hundred sixty-six".