66355393 has 32 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 55883520.

The previous prime is 66355379. The next prime is 66355397. The reversal of 66355393 is 39355366.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66355393 - 2¹³ = 66347201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66355397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 934548 + ... + 934618.

It is an arithmetic number, because the mean of its divisors is an integer number (2441880).

Almost surely, 2^66355393 is an apocalyptic number.

It is an amenable number.

66355393 is a deficient number, since it is larger than the sum of its proper divisors (11784767).

66355393 is a wasteful number, since it uses less digits than its factorization.

66355393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its digits is 218700, while the sum is 40.

The square root of 66355393 is about 8145.8819657542. The cubic root of 66355393 is about 404.8480718563.

The spelling of 66355393 in words is "sixty-six million, three hundred fifty-five thousand, three hundred ninety-three".