66888427 has 4 divisors (see below), whose sum is σ = 66918880. Its totient is φ = 66857976.

The previous prime is 66888407. The next prime is 66888433. The reversal of 66888427 is 72488866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72488866 = 2 ⋅36244433.

It is a cyclic number.

It is not a de Polignac number, because 66888427 - 2⁷ = 66888299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66888407) 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 3 ways as a sum of consecutive naturals, for example, 11652 + ... + 16417.

It is an arithmetic number, because the mean of its divisors is an integer number (16729720).

Almost surely, 2^66888427 is an apocalyptic number.

66888427 is a deficient number, since it is larger than the sum of its proper divisors (30453).

66888427 is a wasteful number, since it uses less digits than its factorization.

66888427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30452.

The product of its digits is 1032192, while the sum is 49.

The square root of 66888427 is about 8178.5345264295. The cubic root of 66888427 is about 405.9292324908.

The spelling of 66888427 in words is "sixty-six million, eight hundred eighty-eight thousand, four hundred twenty-seven".