16983308608561 has 9 divisors (see below), whose sum is σ = 17924294771481. Its totient is φ = 16089376081284.

The previous prime is 16983308608423. The next prime is 16983308608571. The reversal of 16983308608561 is 16580680338961.

The square root of 16983308608561 is 4121081.

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

It is not a de Polignac number, because 16983308608561 - 2¹³ = 16983308600369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16983308608493 and 16983308608502.

It is not an unprimeable number, because it can be changed into a prime (16983308608571) 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, 78192090 + ... + 78408988.

Almost surely, 2^{16983308608561} is an apocalyptic number.

16983308608561 is the 4121081-st square number.

16983308608561 is the 2060541-st centered octagonal number.

It is an amenable number.

16983308608561 is a deficient number, since it is larger than the sum of its proper divisors (940986162920).

16983308608561 is an frugal number, since it uses more digits than its factorization.

16983308608561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433836 (or 216918 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 16983308608561 in words is "sixteen trillion, nine hundred eighty-three billion, three hundred eight million, six hundred eight thousand, five hundred sixty-one".