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16662101 = 52131981
BaseRepresentation
bin111111100011…
…111001010101
31011100112002212
4333203321111
513231141401
61353043205
7261424361
oct77437125
934315085
1016662101
119450535
1256b6505
1335b5041
1422da2a1
1516e1dbb
hexfe3e55

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.

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

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10126661 = 59317077.

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 2k-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, 216662101 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.

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

Divisors: 1 521 31981 16662101