66678271 has 4 divisors (see below), whose sum is σ = 72739944. Its totient is φ = 60616600.

The previous prime is 66678263. The next prime is 66678317. The reversal of 66678271 is 17287666.

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

It is not a de Polignac number, because 66678271 - 2³ = 66678263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66678211) 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, 3030820 + ... + 3030841.

It is an arithmetic number, because the mean of its divisors is an integer number (18184986).

Almost surely, 2^66678271 is an apocalyptic number.

66678271 is a deficient number, since it is larger than the sum of its proper divisors (6061673).

66678271 is a wasteful number, since it uses less digits than its factorization.

66678271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061672.

The product of its digits is 169344, while the sum is 43.

The square root of 66678271 is about 8165.6763957433. The cubic root of 66678271 is about 405.5036583064.

The spelling of 66678271 in words is "sixty-six million, six hundred seventy-eight thousand, two hundred seventy-one".