66202105 has 4 divisors (see below), whose sum is σ = 79442532. Its totient is φ = 52961680.

The previous prime is 66202093. The next prime is 66202109. The reversal of 66202105 is 50120266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18757561 + 47444544 = 4331^2 + 6888^2 .

It is not a de Polignac number, because 66202105 - 2¹³ = 66193913 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66202109) 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, 6620206 + ... + 6620215.

It is an arithmetic number, because the mean of its divisors is an integer number (19860633).

Almost surely, 2^66202105 is an apocalyptic number.

It is an amenable number.

66202105 is a deficient number, since it is larger than the sum of its proper divisors (13240427).

66202105 is a wasteful number, since it uses less digits than its factorization.

66202105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13240426.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66202105 is about 8136.4675996405. The cubic root of 66202105 is about 404.5360841540.

The spelling of 66202105 in words is "sixty-six million, two hundred two thousand, one hundred five".