16556868058499 has 4 divisors (see below), whose sum is σ = 16575618759336. Its totient is φ = 16538117357664.

The previous prime is 16556868058447. The next prime is 16556868058547. The reversal of 16556868058499 is 99485086865561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16556868058499 is a prime.

It is a super-2 number, since 2×16556868058499² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16556868058439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9375349094 + ... + 9375350859.

It is an arithmetic number, because the mean of its divisors is an integer number (4143904689834).

Almost surely, 2^{16556868058499} is an apocalyptic number.

16556868058499 is a deficient number, since it is larger than the sum of its proper divisors (18750700837).

16556868058499 is an equidigital number, since it uses as much as digits as its factorization.

16556868058499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18750700836.

The product of its (nonzero) digits is 4478976000, while the sum is 80.

The spelling of 16556868058499 in words is "sixteen trillion, five hundred fifty-six billion, eight hundred sixty-eight million, fifty-eight thousand, four hundred ninety-nine".