16716720105 has 12 divisors (see below), whose sum is σ = 28975648260. Its totient is φ = 8915584032.

The previous prime is 16716720079. The next prime is 16716720107. The reversal of 16716720105 is 50102761761.

It can be written as a sum of positive squares in 2 ways, for example, as 13100862681 + 3615857424 = 114459^2 + 60132^2 .

It is not a de Polignac number, because 16716720105 - 2¹⁷ = 16716589033 is a prime.

It is a super-2 number, since 2×16716720105² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16716720105.

It is not an unprimeable number, because it can be changed into a prime (16716720107) 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, 185741290 + ... + 185741379.

It is an arithmetic number, because the mean of its divisors is an integer number (2414637355).

Almost surely, 2^16716720105 is an apocalyptic number.

16716720105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16716720105 is a deficient number, since it is larger than the sum of its proper divisors (12258928155).

16716720105 is a wasteful number, since it uses less digits than its factorization.

16716720105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371482680 (or 371482677 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 16716720105 in words is "sixteen billion, seven hundred sixteen million, seven hundred twenty thousand, one hundred five".