18201899798 has 8 divisors (see below), whose sum is σ = 28183586880. Its totient is φ = 8807370840.

The previous prime is 18201899783. The next prime is 18201899809. The reversal of 18201899798 is 89799810281.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (62), and also a Moran number because the ratio is a prime number: 293579029 = 18201899798 / (1 + 8 + 2 + 0 + 1 + 8 + 9 + 9 + 7 + 9 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 18201899798.

It is a congruent 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, 146789453 + ... + 146789576.

It is an arithmetic number, because the mean of its divisors is an integer number (3522948360).

Almost surely, 2^18201899798 is an apocalyptic number.

18201899798 is a deficient number, since it is larger than the sum of its proper divisors (9981687082).

18201899798 is a wasteful number, since it uses less digits than its factorization.

18201899798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293579062.

The product of its (nonzero) digits is 5225472, while the sum is 62.

The spelling of 18201899798 in words is "eighteen billion, two hundred one million, eight hundred ninety-nine thousand, seven hundred ninety-eight".