16605009 has 24 divisors (see below), whose sum is σ = 24833952. Its totient is φ = 10684800.

The previous prime is 16604999. The next prime is 16605037. The reversal of 16605009 is 90050661.

It is not a de Polignac number, because 16605009 - 2¹¹ = 16602961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16605109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41209 + ... + 41609.

It is an arithmetic number, because the mean of its divisors is an integer number (1034748).

Almost surely, 2^16605009 is an apocalyptic number.

It is an amenable number.

16605009 is a deficient number, since it is larger than the sum of its proper divisors (8228943).

16605009 is a wasteful number, since it uses less digits than its factorization.

16605009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 16605009 is about 4074.9244164769. The cubic root of 16605009 is about 255.1210958867.

The spelling of 16605009 in words is "sixteen million, six hundred five thousand, nine".