66805027 has 4 divisors (see below), whose sum is σ = 66853080. Its totient is φ = 66756976.

The previous prime is 66805021. The next prime is 66805073. The reversal of 66805027 is 72050866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72050866 = 2 ⋅36025433.

It is a cyclic number.

It is not a de Polignac number, because 66805027 - 2²³ = 58416419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66804983 and 66805001.

It is not an unprimeable number, because it can be changed into a prime (66805021) 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, 21877 + ... + 24742.

It is an arithmetic number, because the mean of its divisors is an integer number (16713270).

Almost surely, 2^66805027 is an apocalyptic number.

66805027 is a deficient number, since it is larger than the sum of its proper divisors (48053).

66805027 is a wasteful number, since it uses less digits than its factorization.

66805027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48052.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 66805027 is about 8173.4342231402. The cubic root of 66805027 is about 405.7604510350.

The spelling of 66805027 in words is "sixty-six million, eight hundred five thousand, twenty-seven".