16656889523309 has 16 divisors (see below), whose sum is σ = 19135684972800. Its totient is φ = 14202923785344.

The previous prime is 16656889523293. The next prime is 16656889523363. The reversal of 16656889523309 is 90332598865661.

It is not a de Polignac number, because 16656889523309 - 2⁴ = 16656889523293 is a prime.

It is a super-2 number, since 2×16656889523309² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656889523389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9342272 + ... + 10981430.

It is an arithmetic number, because the mean of its divisors is an integer number (1195980310800).

Almost surely, 2^{16656889523309} is an apocalyptic number.

It is an amenable number.

16656889523309 is a deficient number, since it is larger than the sum of its proper divisors (2478795449491).

16656889523309 is a wasteful number, since it uses less digits than its factorization.

16656889523309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646732.

The product of its (nonzero) digits is 503884800, while the sum is 71.

The spelling of 16656889523309 in words is "sixteen trillion, six hundred fifty-six billion, eight hundred eighty-nine million, five hundred twenty-three thousand, three hundred nine".