16205266643 has 12 divisors (see below), whose sum is σ = 17223024192. Its totient is φ = 15244544640.

The previous prime is 16205266621. The next prime is 16205266673. The reversal of 16205266643 is 34666250261.

It is a happy number.

It is not a de Polignac number, because 16205266643 - 2¹⁰ = 16205265619 is a prime.

It is a super-2 number, since 2×16205266643² (a number of 21 digits) contains 22 as substring.

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 16205266643.

It is not an unprimeable number, because it can be changed into a prime (16205266673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 629246 + ... + 654492.

It is an arithmetic number, because the mean of its divisors is an integer number (1435252016).

Almost surely, 2^16205266643 is an apocalyptic number.

16205266643 is a deficient number, since it is larger than the sum of its proper divisors (1017757549).

16205266643 is a wasteful number, since it uses less digits than its factorization.

16205266643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27502 (or 27485 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 16205266643 in words is "sixteen billion, two hundred five million, two hundred sixty-six thousand, six hundred forty-three".