66733427 has 4 divisors (see below), whose sum is σ = 67394256. Its totient is φ = 66072600.

The previous prime is 66733409. The next prime is 66733441. The reversal of 66733427 is 72433766.

It is a happy number.

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 66733427 - 2⁸ = 66733171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66733477) 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, 330263 + ... + 330464.

It is an arithmetic number, because the mean of its divisors is an integer number (16848564).

Almost surely, 2^66733427 is an apocalyptic number.

66733427 is a deficient number, since it is larger than the sum of its proper divisors (660829).

66733427 is a wasteful number, since it uses less digits than its factorization.

66733427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660828.

The product of its digits is 127008, while the sum is 38.

The square root of 66733427 is about 8169.0530050918. The cubic root of 66733427 is about 405.6154378275.

The spelling of 66733427 in words is "sixty-six million, seven hundred thirty-three thousand, four hundred twenty-seven".