16662101 has 4 divisors (see below), whose sum is σ = 16694604. Its totient is φ = 16629600.

The previous prime is 16662073. The next prime is 16662103. The reversal of 16662101 is 10126661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10126661 = 593 ⋅17077.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 14070001 = 1610^2 + 3751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16662101 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 (16662103) 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, 15470 + ... + 16511.

It is an arithmetic number, because the mean of its divisors is an integer number (4173651).

Almost surely, 2^16662101 is an apocalyptic number.

It is an amenable number.

16662101 is a deficient number, since it is larger than the sum of its proper divisors (32503).

16662101 is an equidigital number, since it uses as much as digits as its factorization.

16662101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32502.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16662101 is about 4081.9236886547. The cubic root of 16662101 is about 255.4131505781.

Adding to 16662101 its reverse (10126661), we get a palindrome (26788762).

The spelling of 16662101 in words is "sixteen million, six hundred sixty-two thousand, one hundred one".