16551505165 has 16 divisors (see below), whose sum is σ = 21393893808. Its totient is φ = 12220217856.

The previous prime is 16551505141. The next prime is 16551505273. The reversal of 16551505165 is 56150515561.

It can be written as a sum of positive squares in 8 ways, for example, as 8645094441 + 7906410724 = 92979^2 + 88918^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551505165 - 2¹⁷ = 16551374093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345199 + ... + 390211.

It is an arithmetic number, because the mean of its divisors is an integer number (1337118363).

Almost surely, 2^16551505165 is an apocalyptic number.

It is an amenable number.

16551505165 is a deficient number, since it is larger than the sum of its proper divisors (4842388643).

16551505165 is a wasteful number, since it uses less digits than its factorization.

16551505165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50688.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 16551505165 in words is "sixteen billion, five hundred fifty-one million, five hundred five thousand, one hundred sixty-five".