18638733066 has 8 divisors (see below), whose sum is σ = 37277466144. Its totient is φ = 6212911020.

The previous prime is 18638733053. The next prime is 18638733073. The reversal of 18638733066 is 66033783681.

It is a happy number.

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

18638733066 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553227750 + ... + 1553227761.

It is an arithmetic number, because the mean of its divisors is an integer number (4659683268).

Almost surely, 2^18638733066 is an apocalyptic number.

18638733066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18638733066 is a wasteful number, since it uses less digits than its factorization.

18638733066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106455516.

The product of its (nonzero) digits is 2612736, while the sum is 51.

It can be divided in two parts, 186387 and 33066, that added together give a triangular number (219453 = T₆₆₂).

The spelling of 18638733066 in words is "eighteen billion, six hundred thirty-eight million, seven hundred thirty-three thousand, sixty-six".