66603331 has 8 divisors (see below), whose sum is σ = 73587744. Its totient is φ = 59959680.

The previous prime is 66603323. The next prime is 66603337. The reversal of 66603331 is 13330666.

66603331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66603331 - 2³ = 66603323 is a prime.

It is a super-2 number, since 2×66603331² = 8872007400591122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66603331.

It is not an unprimeable number, because it can be changed into a prime (66603337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84780 + ... + 85561.

It is an arithmetic number, because the mean of its divisors is an integer number (9198468).

Almost surely, 2^66603331 is an apocalyptic number.

66603331 is a deficient number, since it is larger than the sum of its proper divisors (6984413).

66603331 is a wasteful number, since it uses less digits than its factorization.

66603331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170381.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 66603331 is about 8161.0863860150. The cubic root of 66603331 is about 405.3516855804.

Adding to 66603331 its reverse (13330666), we get a palindrome (79933997).

The spelling of 66603331 in words is "sixty-six million, six hundred three thousand, three hundred thirty-one".