16515656165 has 16 divisors (see below), whose sum is σ = 20506143600. Its totient is φ = 12754463232.

The previous prime is 16515656119. The next prime is 16515656173. The reversal of 16515656165 is 56165651561.

It can be written as a sum of positive squares in 8 ways, for example, as 845123041 + 15670533124 = 29071^2 + 125182^2 .

It is a cyclic number.

It is not a de Polignac number, because 16515656165 - 2²⁶ = 16448547301 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1215449 + ... + 1228961.

It is an arithmetic number, because the mean of its divisors is an integer number (1281633975).

Almost surely, 2^16515656165 is an apocalyptic number.

It is an amenable number.

16515656165 is a deficient number, since it is larger than the sum of its proper divisors (3990487435).

16515656165 is a wasteful number, since it uses less digits than its factorization.

16515656165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21976.

The product of its digits is 810000, while the sum is 47.

The spelling of 16515656165 in words is "sixteen billion, five hundred fifteen million, six hundred fifty-six thousand, one hundred sixty-five".