66355331 has 4 divisors (see below), whose sum is σ = 75834672. Its totient is φ = 56875992.

The previous prime is 66355327. The next prime is 66355337. The reversal of 66355331 is 13355366.

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 66355331 - 2² = 66355327 is a prime.

It is a super-2 number, since 2×66355331² = 8806059904239122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66355337) 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 3 ways as a sum of consecutive naturals, for example, 4739660 + ... + 4739673.

It is an arithmetic number, because the mean of its divisors is an integer number (18958668).

Almost surely, 2^66355331 is an apocalyptic number.

66355331 is a deficient number, since it is larger than the sum of its proper divisors (9479341).

66355331 is an equidigital number, since it uses as much as digits as its factorization.

66355331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479340.

The product of its digits is 24300, while the sum is 32.

The square root of 66355331 is about 8145.8781601495. The cubic root of 66355331 is about 404.8479457646.

The spelling of 66355331 in words is "sixty-six million, three hundred fifty-five thousand, three hundred thirty-one".