16650081 has 24 divisors (see below), whose sum is σ = 27715584. Its totient is φ = 9434880.

The previous prime is 16650071. The next prime is 16650083. The reversal of 16650081 is 18005661.

16650081 is a `hidden beast` number, since 1 + 6 + 650 + 0 + 8 + 1 = 666.

It is not a de Polignac number, because 16650081 - 2⁹ = 16649569 is a prime.

It is a super-2 number, since 2×16650081² = 554450394613122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16650083) 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, 6961 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (1154816).

Almost surely, 2^16650081 is an apocalyptic number.

It is an amenable number.

16650081 is a deficient number, since it is larger than the sum of its proper divisors (11065503).

16650081 is a wasteful number, since it uses less digits than its factorization.

16650081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221 (or 2218 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 16650081 is about 4080.4510780060. The cubic root of 16650081 is about 255.3517176569.

The spelling of 16650081 in words is "sixteen million, six hundred fifty thousand, eighty-one".