66394105 has 4 divisors (see below), whose sum is σ = 79672932. Its totient is φ = 53115280.

The previous prime is 66394103. The next prime is 66394117. The reversal of 66394105 is 50149366.

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 10995856 + 55398249 = 3316^2 + 7443^2 .

It is not a de Polignac number, because 66394105 - 2¹ = 66394103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66394103) 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, 6639406 + ... + 6639415.

It is an arithmetic number, because the mean of its divisors is an integer number (19918233).

Almost surely, 2^66394105 is an apocalyptic number.

It is an amenable number.

66394105 is a deficient number, since it is larger than the sum of its proper divisors (13278827).

66394105 is a wasteful number, since it uses less digits than its factorization.

66394105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13278826.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66394105 is about 8148.2577892455. The cubic root of 66394105 is about 404.9267865422.

The spelling of 66394105 in words is "sixty-six million, three hundred ninety-four thousand, one hundred five".