66019427 has 4 divisors (see below), whose sum is σ = 66075960. Its totient is φ = 65962896.

The previous prime is 66019417. The next prime is 66019439. The reversal of 66019427 is 72491066.

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 66019427 - 2¹⁶ = 65953891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66019417) 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, 26477 + ... + 28862.

It is an arithmetic number, because the mean of its divisors is an integer number (16518990).

Almost surely, 2^66019427 is an apocalyptic number.

66019427 is a deficient number, since it is larger than the sum of its proper divisors (56533).

66019427 is a wasteful number, since it uses less digits than its factorization.

66019427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56532.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 66019427 is about 8125.2339658622. The cubic root of 66019427 is about 404.1636492683.

The spelling of 66019427 in words is "sixty-six million, nineteen thousand, four hundred twenty-seven".