16923668281 has 9 divisors (see below), whose sum is σ = 18327460431. Its totient is φ = 15620286552.

The previous prime is 16923668261. The next prime is 16923668323. The reversal of 16923668281 is 18286632961.

The square root of 16923668281 is 130091.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2503501225 + 14420167056 = 50035^2 + 120084^2 .

It is not a de Polignac number, because 16923668281 - 2¹¹ = 16923666233 is a prime.

It is a super-2 number, since 2×16923668281² (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 (16923668231) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1686180 + ... + 1696186.

Almost surely, 2^16923668281 is an apocalyptic number.

16923668281 is the 130091-st square number.

16923668281 is the 65046-th centered octagonal number.

It is an amenable number.

16923668281 is a deficient number, since it is larger than the sum of its proper divisors (1403792150).

16923668281 is an frugal number, since it uses more digits than its factorization.

16923668281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20040 (or 10020 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The spelling of 16923668281 in words is "sixteen billion, nine hundred twenty-three million, six hundred sixty-eight thousand, two hundred eighty-one".