66806427 has 8 divisors (see below), whose sum is σ = 89892880. Its totient is φ = 44128800.

The previous prime is 66806387. The next prime is 66806431. The reversal of 66806427 is 72460866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66806427 - 2⁸ = 66806171 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101824 + ... + 102477.

It is an arithmetic number, because the mean of its divisors is an integer number (11236610).

Almost surely, 2^66806427 is an apocalyptic number.

66806427 is a deficient number, since it is larger than the sum of its proper divisors (23086453).

66806427 is a wasteful number, since it uses less digits than its factorization.

66806427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204413.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 66806427 is about 8173.5198660063. The cubic root of 66806427 is about 405.7632854557.

The spelling of 66806427 in words is "sixty-six million, eight hundred six thousand, four hundred twenty-seven".