18856022399 has 8 divisors (see below), whose sum is σ = 19384322880. Its totient is φ = 18328705056.

The previous prime is 18856022387. The next prime is 18856022417. The reversal of 18856022399 is 99322065881.

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

It is a cyclic number.

It is not a de Polignac number, because 18856022399 - 2²⁸ = 18587586943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18856022399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18856022369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206804 + ... + 283689.

It is an arithmetic number, because the mean of its divisors is an integer number (2423040360).

Almost surely, 2^18856022399 is an apocalyptic number.

18856022399 is a deficient number, since it is larger than the sum of its proper divisors (528300481).

18856022399 is a wasteful number, since it uses less digits than its factorization.

18856022399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491569.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 18856022399 in words is "eighteen billion, eight hundred fifty-six million, twenty-two thousand, three hundred ninety-nine".