66814471 has 8 divisors (see below), whose sum is σ = 73821024. Its totient is φ = 60149760.

The previous prime is 66814457. The next prime is 66814519. The reversal of 66814471 is 17441866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66814471 - 2⁵ = 66814439 is a prime.

It is a super-3 number, since 3×66814471³ (a number of 24 digits) contains 333 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 66814471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66814411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85050 + ... + 85831.

It is an arithmetic number, because the mean of its divisors is an integer number (9227628).

Almost surely, 2^66814471 is an apocalyptic number.

66814471 is a deficient number, since it is larger than the sum of its proper divisors (7006553).

66814471 is a wasteful number, since it uses less digits than its factorization.

66814471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170921.

The product of its digits is 32256, while the sum is 37.

The square root of 66814471 is about 8174.0119280559. The cubic root of 66814471 is about 405.7795704601.

The spelling of 66814471 in words is "sixty-six million, eight hundred fourteen thousand, four hundred seventy-one".