16558975923849 has 12 divisors (see below), whose sum is σ = 24804391919216. Its totient is φ = 11039317282404.

The previous prime is 16558975923839. The next prime is 16558975923851. The reversal of 16558975923849 is 94832957985561.

16558975923849 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 89 + 75 + 92 + 384 + 9 = 666.

It is not a de Polignac number, because 16558975923849 - 2⁹ = 16558975923337 is a prime.

It is a super-2 number, since 2×16558975923849² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16558975923829) 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, 34071966679 + ... + 34071967164.

Almost surely, 2^{16558975923849} is an apocalyptic number.

It is an amenable number.

16558975923849 is a deficient number, since it is larger than the sum of its proper divisors (8245415995367).

16558975923849 is an frugal number, since it uses more digits than its factorization.

16558975923849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68143933858 (or 68143933846 counting only the distinct ones).

The product of its digits is 5878656000, while the sum is 81.

The spelling of 16558975923849 in words is "sixteen trillion, five hundred fifty-eight billion, nine hundred seventy-five million, nine hundred twenty-three thousand, eight hundred forty-nine".