16501161605 has 24 divisors (see below), whose sum is σ = 21052475880. Its totient is φ = 12413905920.

The previous prime is 16501161587. The next prime is 16501161619. The reversal of 16501161605 is 50616110561.

It can be written as a sum of positive squares in 12 ways, for example, as 55920484 + 16445241121 = 7478^2 + 128239^2 .

It is not a de Polignac number, because 16501161605 - 2¹² = 16501157509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1991411 + ... + 1999679.

It is an arithmetic number, because the mean of its divisors is an integer number (877186495).

Almost surely, 2^16501161605 is an apocalyptic number.

It is an amenable number.

16501161605 is a deficient number, since it is larger than the sum of its proper divisors (4551314275).

16501161605 is a wasteful number, since it uses less digits than its factorization.

16501161605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9689 (or 9672 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 16501161605 in words is "sixteen billion, five hundred one million, one hundred sixty-one thousand, six hundred five".