66320313 has 4 divisors (see below), whose sum is σ = 88427088. Its totient is φ = 44213540.

The previous prime is 66320311. The next prime is 66320321. The reversal of 66320313 is 31302366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66320313 - 2¹ = 66320311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66320311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11053383 + ... + 11053388.

It is an arithmetic number, because the mean of its divisors is an integer number (22106772).

Almost surely, 2^66320313 is an apocalyptic number.

It is an amenable number.

66320313 is a deficient number, since it is larger than the sum of its proper divisors (22106775).

66320313 is a wasteful number, since it uses less digits than its factorization.

66320313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22106774.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 66320313 is about 8143.7284458656. The cubic root of 66320313 is about 404.7767158183.

Adding to 66320313 its reverse (31302366), we get a palindrome (97622679).

The spelling of 66320313 in words is "sixty-six million, three hundred twenty thousand, three hundred thirteen".