16999205161 has 9 divisors (see below), whose sum is σ = 17101645029. Its totient is φ = 16897377600.

The previous prime is 16999205141. The next prime is 16999205177. The reversal of 16999205161 is 16150299961.

The square root of 16999205161 is 130381.

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

It can be written as a sum of positive squares in 4 ways, for example, as 435515161 + 16563690000 = 20869^2 + 128700^2 .

It is not a de Polignac number, because 16999205161 - 2¹¹ = 16999203113 is a prime.

It is a super-2 number, since 2×16999205161² (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 (16999205141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31421551 + ... + 31422091.

It is an arithmetic number, because the mean of its divisors is an integer number (1900182781).

Almost surely, 2^16999205161 is an apocalyptic number.

16999205161 is the 130381-st square number.

16999205161 is the 65191-st centered octagonal number.

It is an amenable number.

16999205161 is a deficient number, since it is larger than the sum of its proper divisors (102439868).

16999205161 is an frugal number, since it uses more digits than its factorization.

16999205161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 49.

Multiplying 16999205161 by its sum of digits (49), we get a square (832961052889 = 912667²).

The spelling of 16999205161 in words is "sixteen billion, nine hundred ninety-nine million, two hundred five thousand, one hundred sixty-one".