66566105 has 4 divisors (see below), whose sum is σ = 79879332. Its totient is φ = 53252880.

The previous prime is 66566099. The next prime is 66566131. The reversal of 66566105 is 50166566.

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 35952016 + 30614089 = 5996^2 + 5533^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66566105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6656606 + ... + 6656615.

It is an arithmetic number, because the mean of its divisors is an integer number (19969833).

Almost surely, 2^66566105 is an apocalyptic number.

It is an amenable number.

66566105 is a deficient number, since it is larger than the sum of its proper divisors (13313227).

66566105 is a wasteful number, since it uses less digits than its factorization.

66566105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13313226.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 66566105 is about 8158.8053659834. The cubic root of 66566105 is about 405.2761516504.

The spelling of 66566105 in words is "sixty-six million, five hundred sixty-six thousand, one hundred five".