16642081 has 16 divisors (see below), whose sum is σ = 18123840. Its totient is φ = 15232320.

The previous prime is 16642069. The next prime is 16642091. The reversal of 16642081 is 18024661.

It is a cyclic number.

It is not a de Polignac number, because 16642081 - 2¹¹ = 16640033 is a prime.

It is a super-2 number, since 2×16642081² = 553917720021122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96111 + ... + 96283.

It is an arithmetic number, because the mean of its divisors is an integer number (1132740).

Almost surely, 2^16642081 is an apocalyptic number.

It is an amenable number.

16642081 is a deficient number, since it is larger than the sum of its proper divisors (1481759).

16642081 is a wasteful number, since it uses less digits than its factorization.

16642081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 16642081 is about 4079.4706764481. The cubic root of 16642081 is about 255.3108141321.

The spelling of 16642081 in words is "sixteen million, six hundred forty-two thousand, eighty-one".