16672081 has 4 divisors (see below), whose sum is σ = 16883200. Its totient is φ = 16460964.

The previous prime is 16672049. The next prime is 16672099. The reversal of 16672081 is 18027661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16672081 - 2⁵ = 16672049 is a prime.

It is a super-2 number, since 2×16672081² = 555916569741122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16672001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105441 + ... + 105598.

It is an arithmetic number, because the mean of its divisors is an integer number (4220800).

Almost surely, 2^16672081 is an apocalyptic number.

It is an amenable number.

16672081 is a deficient number, since it is larger than the sum of its proper divisors (211119).

16672081 is an equidigital number, since it uses as much as digits as its factorization.

16672081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211118.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 16672081 is about 4083.1459684905. The cubic root of 16672081 is about 255.4641348345.

The spelling of 16672081 in words is "sixteen million, six hundred seventy-two thousand, eighty-one".