16623389281 has 8 divisors (see below), whose sum is σ = 16690855104. Its totient is φ = 16555997040.

The previous prime is 16623389273. The next prime is 16623389291. The reversal of 16623389281 is 18298332661.

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 16623389281 - 2³ = 16623389273 is a prime.

It is a super-2 number, since 2×16623389281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16623389291) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 459276 + ... + 494146.

It is an arithmetic number, because the mean of its divisors is an integer number (2086356888).

Almost surely, 2^16623389281 is an apocalyptic number.

It is an amenable number.

16623389281 is a deficient number, since it is larger than the sum of its proper divisors (67465823).

16623389281 is a wasteful number, since it uses less digits than its factorization.

16623389281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36791.

The product of its digits is 746496, while the sum is 49.

The spelling of 16623389281 in words is "sixteen billion, six hundred twenty-three million, three hundred eighty-nine thousand, two hundred eighty-one".