66056005 has 4 divisors (see below), whose sum is σ = 79267212. Its totient is φ = 52844800.

The previous prime is 66055993. The next prime is 66056017. The reversal of 66056005 is 50065066.

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

It is an interprime number because it is at equal distance from previous prime (66055993) and next prime (66056017).

It can be written as a sum of positive squares in 2 ways, for example, as 29658916 + 36397089 = 5446^2 + 6033^2 .

It is not a de Polignac number, because 66056005 - 2⁵ = 66055973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6605596 + ... + 6605605.

It is an arithmetic number, because the mean of its divisors is an integer number (19816803).

Almost surely, 2^66056005 is an apocalyptic number.

It is an amenable number.

66056005 is a deficient number, since it is larger than the sum of its proper divisors (13211207).

66056005 is a wasteful number, since it uses less digits than its factorization.

66056005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13211206.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66056005 is about 8127.4845432028. The cubic root of 66056005 is about 404.2382776478.

It can be divided in two parts, 660 and 56005, that added together give a palindrome (56665).

The spelling of 66056005 in words is "sixty-six million, fifty-six thousand, five".