18699001850 has 24 divisors (see below), whose sum is σ = 34798886940. Its totient is φ = 7475569920.

The previous prime is 18699001847. The next prime is 18699001861. The reversal of 18699001850 is 5810099681.

It can be written as a sum of positive squares in 6 ways, for example, as 2989136929 + 15709864921 = 54673^2 + 125339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18699001795 and 18699001804.

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 11 ways as a sum of consecutive naturals, for example, 6185 + ... + 193484.

Almost surely, 2^18699001850 is an apocalyptic number.

18699001850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18699001850 is a deficient number, since it is larger than the sum of its proper divisors (16099885090).

18699001850 is a wasteful number, since it uses less digits than its factorization.

18699001850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201554 (or 201549 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The spelling of 18699001850 in words is "eighteen billion, six hundred ninety-nine million, one thousand, eight hundred fifty".