5605821999 has 30 divisors (see below), whose sum is σ = 8442056744. Its totient is φ = 3706981200.

The previous prime is 5605821989. The next prime is 5605822021. The reversal of 5605821999 is 9991285065.

5605821999 is a `hidden beast` number, since 5 + 605 + 8 + 21 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 5605821999 - 2⁵ = 5605821967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5605821989) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8280049 + ... + 8280725.

Almost surely, 2^5605821999 is an apocalyptic number.

5605821999 is a deficient number, since it is larger than the sum of its proper divisors (2836234745).

5605821999 is an frugal number, since it uses more digits than its factorization.

5605821999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The square root of 5605821999 is about 74872.0374973194. The cubic root of 5605821999 is about 1776.4231922720.

The spelling of 5605821999 in words is "five billion, six hundred five million, eight hundred twenty-one thousand, nine hundred ninety-nine".