16516520165 has 16 divisors (see below), whose sum is σ = 20866144320. Its totient is φ = 12515880960.

The previous prime is 16516520161. The next prime is 16516520201. The reversal of 16516520165 is 56102561561.

It is a happy number.

It is not a de Polignac number, because 16516520165 - 2² = 16516520161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516520161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165925 + ... + 1180005.

It is an arithmetic number, because the mean of its divisors is an integer number (1304134020).

Almost surely, 2^16516520165 is an apocalyptic number.

It is an amenable number.

16516520165 is a deficient number, since it is larger than the sum of its proper divisors (4349624155).

16516520165 is a wasteful number, since it uses less digits than its factorization.

16516520165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26452.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 16516520165 in words is "sixteen billion, five hundred sixteen million, five hundred twenty thousand, one hundred sixty-five".