66242313 has 8 divisors (see below), whose sum is σ = 98136800. Its totient is φ = 44161524.

The previous prime is 66242291. The next prime is 66242327. The reversal of 66242313 is 31324266.

66242313 is a `hidden beast` number, since 6 + 624 + 2 + 31 + 3 = 666.

It is not a de Polignac number, because 66242313 - 2⁶ = 66242249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2453419 = 66242313 / (6 + 6 + 2 + 4 + 2 + 3 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66242333) 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, 1226683 + ... + 1226736.

It is an arithmetic number, because the mean of its divisors is an integer number (12267100).

Almost surely, 2^66242313 is an apocalyptic number.

It is an amenable number.

66242313 is a deficient number, since it is larger than the sum of its proper divisors (31894487).

66242313 is a wasteful number, since it uses less digits than its factorization.

66242313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453428 (or 2453422 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 66242313 is about 8138.9380756951. The cubic root of 66242313 is about 404.6179662180.

Adding to 66242313 its reverse (31324266), we get a palindrome (97566579).

The spelling of 66242313 in words is "sixty-six million, two hundred forty-two thousand, three hundred thirteen".