16500985 has 8 divisors (see below), whose sum is σ = 19859400. Its totient is φ = 13161984.

The previous prime is 16500977. The next prime is 16500997. The reversal of 16500985 is 58900561.

It can be written as a sum of positive squares in 4 ways, for example, as 3519376 + 12981609 = 1876^2 + 3603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16500985 - 2³ = 16500977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16500985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2910 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (2482425).

Almost surely, 2^16500985 is an apocalyptic number.

It is an amenable number.

16500985 is a deficient number, since it is larger than the sum of its proper divisors (3358415).

16500985 is an equidigital number, since it uses as much as digits as its factorization.

16500985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9707.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 16500985 is about 4062.1404456272. The cubic root of 16500985 is about 254.5872343102.

The spelling of 16500985 in words is "sixteen million, five hundred thousand, nine hundred eighty-five".