66631303 has 8 divisors (see below), whose sum is σ = 67294448. Its totient is φ = 65971584.

The previous prime is 66631297. The next prime is 66631319. The reversal of 66631303 is 30313666.

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

It is a cyclic number.

It is not a de Polignac number, because 66631303 - 2²⁵ = 33076871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66631343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54325 + ... + 55537.

It is an arithmetic number, because the mean of its divisors is an integer number (8411806).

Almost surely, 2^66631303 is an apocalyptic number.

66631303 is a deficient number, since it is larger than the sum of its proper divisors (663145).

66631303 is a wasteful number, since it uses less digits than its factorization.

66631303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713.

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

The square root of 66631303 is about 8162.7999485471. The cubic root of 66631303 is about 405.4084240359.

Adding to 66631303 its reverse (30313666), we get a palindrome (96944969).

The spelling of 66631303 in words is "sixty-six million, six hundred thirty-one thousand, three hundred three".