16505166213 has 6 divisors (see below), whose sum is σ = 23840795654. Its totient is φ = 11003444136.

The previous prime is 16505166163. The next prime is 16505166233. The reversal of 16505166213 is 31266150561.

16505166213 is a `hidden beast` number, since 16 + 5 + 0 + 5 + 16 + 621 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15594514884 + 910651329 = 124878^2 + 30177^2 .

It is not a de Polignac number, because 16505166213 - 2⁹ = 16505165701 is a prime.

It is a super-2 number, since 2×16505166213² (a number of 21 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 (16505166233) 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 5 ways as a sum of consecutive naturals, for example, 916953670 + ... + 916953687.

Almost surely, 2^16505166213 is an apocalyptic number.

It is an amenable number.

16505166213 is a deficient number, since it is larger than the sum of its proper divisors (7335629441).

16505166213 is a wasteful number, since it uses less digits than its factorization.

16505166213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833907363 (or 1833907360 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 16505166213 in words is "sixteen billion, five hundred five million, one hundred sixty-six thousand, two hundred thirteen".