16820231999 has 8 divisors (see below), whose sum is σ = 17372160000. Its totient is φ = 16268887800.

The previous prime is 16820231983. The next prime is 16820232031. The reversal of 16820231999 is 99913202861.

It is a happy number.

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 16820231999 - 2⁴ = 16820231983 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 (16820231899) 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, 86999 + ... + 203000.

It is an arithmetic number, because the mean of its divisors is an integer number (2171520000).

Almost surely, 2^16820231999 is an apocalyptic number.

16820231999 is a deficient number, since it is larger than the sum of its proper divisors (551928001).

16820231999 is a wasteful number, since it uses less digits than its factorization.

16820231999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291901.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 16820231999 in words is "sixteen billion, eight hundred twenty million, two hundred thirty-one thousand, nine hundred ninety-nine".