66894427 has 8 divisors (see below), whose sum is σ = 68454720. Its totient is φ = 65345280.

The previous prime is 66894407. The next prime is 66894433. The reversal of 66894427 is 72449866.

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 66894427 - 2¹¹ = 66892379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66894407) 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, 10027 + ... + 15307.

It is an arithmetic number, because the mean of its divisors is an integer number (8556840).

Almost surely, 2^66894427 is an apocalyptic number.

66894427 is a deficient number, since it is larger than the sum of its proper divisors (1560293).

66894427 is a wasteful number, since it uses less digits than its factorization.

66894427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573.

The product of its digits is 580608, while the sum is 46.

The square root of 66894427 is about 8178.9013320861. The cubic root of 66894427 is about 405.9413696306.

The spelling of 66894427 in words is "sixty-six million, eight hundred ninety-four thousand, four hundred twenty-seven".