16642135 has 4 divisors (see below), whose sum is σ = 19970568. Its totient is φ = 13313704.

The previous prime is 16642127. The next prime is 16642139. The reversal of 16642135 is 53124661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53124661 = 709 ⋅74929.

It is a cyclic number.

It is not a de Polignac number, because 16642135 - 2³ = 16642127 is a prime.

It is a Duffinian number.

It is a congruent 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, 1664209 + ... + 1664218.

It is an arithmetic number, because the mean of its divisors is an integer number (4992642).

Almost surely, 2^16642135 is an apocalyptic number.

16642135 is a deficient number, since it is larger than the sum of its proper divisors (3328433).

16642135 is an equidigital number, since it uses as much as digits as its factorization.

16642135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328432.

The product of its digits is 4320, while the sum is 28.

The square root of 16642135 is about 4079.4772949485. The cubic root of 16642135 is about 255.3110902749.

Adding to 16642135 its reverse (53124661), we get a palindrome (69766796).

The spelling of 16642135 in words is "sixteen million, six hundred forty-two thousand, one hundred thirty-five".