66231813 has 16 divisors (see below), whose sum is σ = 96033600. Its totient is φ = 40432896.

The previous prime is 66231811. The next prime is 66231817. The reversal of 66231813 is 31813266.

It is not a de Polignac number, because 66231813 - 2¹ = 66231811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66231811) 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, 15663 + ... + 19436.

It is an arithmetic number, because the mean of its divisors is an integer number (6002100).

Almost surely, 2^66231813 is an apocalyptic number.

It is an amenable number.

66231813 is a deficient number, since it is larger than the sum of its proper divisors (29801787).

66231813 is a wasteful number, since it uses less digits than its factorization.

66231813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35156.

The product of its digits is 5184, while the sum is 30.

The square root of 66231813 is about 8138.2930028354. The cubic root of 66231813 is about 404.5965865643.

The spelling of 66231813 in words is "sixty-six million, two hundred thirty-one thousand, eight hundred thirteen".