16642169 has 4 divisors (see below), whose sum is σ = 16651620. Its totient is φ = 16632720.

The previous prime is 16642151. The next prime is 16642177. The reversal of 16642169 is 96124661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6325225 + 10316944 = 2515^2 + 3212^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642169 - 2⁸ = 16641913 is a prime.

It is a super-2 number, since 2×16642169² = 553923578049122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642139) 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, 1214 + ... + 5895.

It is an arithmetic number, because the mean of its divisors is an integer number (4162905).

Almost surely, 2^16642169 is an apocalyptic number.

It is an amenable number.

16642169 is a deficient number, since it is larger than the sum of its proper divisors (9451).

16642169 is an equidigital number, since it uses as much as digits as its factorization.

16642169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450.

The product of its digits is 15552, while the sum is 35.

The square root of 16642169 is about 4079.4814621469. The cubic root of 16642169 is about 255.3112641422.

The spelling of 16642169 in words is "sixteen million, six hundred forty-two thousand, one hundred sixty-nine".