16345665 has 64 divisors (see below), whose sum is σ = 33984000. Its totient is φ = 7451136.

The previous prime is 16345657. The next prime is 16345669. The reversal of 16345665 is 56654361.

16345665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16345665 - 2³ = 16345657 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 (16345669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46129 + ... + 46481.

It is an arithmetic number, because the mean of its divisors is an integer number (531000).

Almost surely, 2^16345665 is an apocalyptic number.

16345665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16345665 is an abundant number, since it is smaller than the sum of its proper divisors (17638335).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16345665 is an equidigital number, since it uses as much as digits as its factorization.

16345665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 368 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 16345665 is about 4042.9772445563. The cubic root of 16345665 is about 253.7859243629.

The spelling of 16345665 in words is "sixteen million, three hundred forty-five thousand, six hundred sixty-five".