66806827 has 4 divisors (see below), whose sum is σ = 66824080. Its totient is φ = 66789576.

The previous prime is 66806819. The next prime is 66806833. The reversal of 66806827 is 72860866.

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 66806827 - 2³ = 66806819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66806027) 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, 178 + ... + 11560.

It is an arithmetic number, because the mean of its divisors is an integer number (16706020).

Almost surely, 2^66806827 is an apocalyptic number.

66806827 is a deficient number, since it is larger than the sum of its proper divisors (17253).

66806827 is a wasteful number, since it uses less digits than its factorization.

66806827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17252.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 66806827 is about 8173.5443352318. The cubic root of 66806827 is about 405.7640952829.

The spelling of 66806827 in words is "sixty-six million, eight hundred six thousand, eight hundred twenty-seven".