16642791 has 12 divisors (see below), whose sum is σ = 26225160. Its totient is φ = 10086480.

The previous prime is 16642771. The next prime is 16642793. The reversal of 16642791 is 19724661.

16642791 is a `hidden beast` number, since 1 + 6 + 642 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 16642791 - 2¹⁰ = 16641767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16642793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83956 + ... + 84153.

It is an arithmetic number, because the mean of its divisors is an integer number (2185430).

Almost surely, 2^16642791 is an apocalyptic number.

16642791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16642791 is a deficient number, since it is larger than the sum of its proper divisors (9582369).

16642791 is a wasteful number, since it uses less digits than its factorization.

16642791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168126 (or 168123 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 16642791 is about 4079.5576966137. The cubic root of 16642791 is about 255.3144448499.

The spelling of 16642791 in words is "sixteen million, six hundred forty-two thousand, seven hundred ninety-one".