66631313 has 16 divisors (see below), whose sum is σ = 80974080. Its totient is φ = 53523456.

The previous prime is 66631297. The next prime is 66631319. The reversal of 66631313 is 31313666.

It is not a de Polignac number, because 66631313 - 2⁴ = 66631297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66631319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30233 + ... + 32361.

It is an arithmetic number, because the mean of its divisors is an integer number (5060880).

Almost surely, 2^66631313 is an apocalyptic number.

It is an amenable number.

66631313 is a deficient number, since it is larger than the sum of its proper divisors (14342767).

66631313 is a wasteful number, since it uses less digits than its factorization.

66631313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416.

The product of its digits is 5832, while the sum is 29.

The square root of 66631313 is about 8162.8005610820. The cubic root of 66631313 is about 405.4084443171.

Adding to 66631313 its reverse (31313666), we get a palindrome (97944979).

The spelling of 66631313 in words is "sixty-six million, six hundred thirty-one thousand, three hundred thirteen".