16965785665 has 16 divisors (see below), whose sum is σ = 21738169728. Its totient is φ = 12680591616.

The previous prime is 16965785663. The next prime is 16965785671. The reversal of 16965785665 is 56658756961.

It is a cyclic number.

It is not a de Polignac number, because 16965785665 - 2¹ = 16965785663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16965785597 and 16965785606.

It is not an unprimeable number, because it can be changed into a prime (16965785663) 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, 1710504 + ... + 1720393.

It is an arithmetic number, because the mean of its divisors is an integer number (1358635608).

Almost surely, 2^16965785665 is an apocalyptic number.

It is an amenable number.

16965785665 is a deficient number, since it is larger than the sum of its proper divisors (4772384063).

16965785665 is a wasteful number, since it uses less digits than its factorization.

16965785665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430968.

The product of its digits is 81648000, while the sum is 64.

The spelling of 16965785665 in words is "sixteen billion, nine hundred sixty-five million, seven hundred eighty-five thousand, six hundred sixty-five".