66929393 has 4 divisors (see below), whose sum is σ = 67846308. Its totient is φ = 66012480.

The previous prime is 66929389. The next prime is 66929417. The reversal of 66929393 is 39392966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31550689 + 35378704 = 5617^2 + 5948^2 .

It is a cyclic number.

It is not a de Polignac number, because 66929393 - 2² = 66929389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66929293) 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, 458348 + ... + 458493.

It is an arithmetic number, because the mean of its divisors is an integer number (16961577).

Almost surely, 2^66929393 is an apocalyptic number.

It is an amenable number.

66929393 is a deficient number, since it is larger than the sum of its proper divisors (916915).

66929393 is an equidigital number, since it uses as much as digits as its factorization.

66929393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916914.

The product of its digits is 472392, while the sum is 47.

The square root of 66929393 is about 8181.0386259936. The cubic root of 66929393 is about 406.0120864012.

The spelling of 66929393 in words is "sixty-six million, nine hundred twenty-nine thousand, three hundred ninety-three".