18668701850 has 12 divisors (see below), whose sum is σ = 34723785534. Its totient is φ = 7467480720.

The previous prime is 18668701841. The next prime is 18668701903. The reversal of 18668701850 is 5810786681.

It can be written as a sum of positive squares in 3 ways, for example, as 16047569041 + 2621132809 = 126679^2 + 51197^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 373374037 = 18668701850 / (1 + 8 + 6 + 6 + 8 + 7 + 0 + 1 + 8 + 5 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186686969 + ... + 186687068.

Almost surely, 2^18668701850 is an apocalyptic number.

18668701850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18668701850 is a deficient number, since it is larger than the sum of its proper divisors (16055083684).

18668701850 is a wasteful number, since it uses less digits than its factorization.

18668701850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373374049 (or 373374044 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 50.

The spelling of 18668701850 in words is "eighteen billion, six hundred sixty-eight million, seven hundred one thousand, eight hundred fifty".