16500649 has 24 divisors (see below), whose sum is σ = 19305216. Its totient is φ = 14071200.

The previous prime is 16500647. The next prime is 16500677. The reversal of 16500649 is 94600561.

It is not a de Polignac number, because 16500649 - 2¹ = 16500647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16500649.

It is not an unprimeable number, because it can be changed into a prime (16500641) 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, 198762 + ... + 198844.

It is an arithmetic number, because the mean of its divisors is an integer number (804384).

Almost surely, 2^16500649 is an apocalyptic number.

It is an amenable number.

16500649 is a deficient number, since it is larger than the sum of its proper divisors (2804567).

16500649 is a wasteful number, since it uses less digits than its factorization.

16500649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 16500649 is about 4062.0990879101. The cubic root of 16500649 is about 254.5855062943.

The spelling of 16500649 in words is "sixteen million, five hundred thousand, six hundred forty-nine".