66505927 has 4 divisors (see below), whose sum is σ = 66718720. Its totient is φ = 66293136.

The previous prime is 66505919. The next prime is 66505969. The reversal of 66505927 is 72950566.

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

It is a cyclic number.

It is not a de Polignac number, because 66505927 - 2³ = 66505919 is a prime.

It is a super-2 number, since 2×66505927² = 8846076652258658, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66505927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105927 + ... + 106552.

It is an arithmetic number, because the mean of its divisors is an integer number (16679680).

Almost surely, 2^66505927 is an apocalyptic number.

66505927 is a deficient number, since it is larger than the sum of its proper divisors (212793).

66505927 is a wasteful number, since it uses less digits than its factorization.

66505927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212792.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 66505927 is about 8155.1166147395. The cubic root of 66505927 is about 405.1539870675.

The spelling of 66505927 in words is "sixty-six million, five hundred five thousand, nine hundred twenty-seven".