66603319313 has 4 divisors (see below), whose sum is σ = 66817478208. Its totient is φ = 66389160420.

The previous prime is 66603319309. The next prime is 66603319327. The reversal of 66603319313 is 31391330666.

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 66603319313 - 2² = 66603319309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66603319303) 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, 107078981 + ... + 107079602.

It is an arithmetic number, because the mean of its divisors is an integer number (16704369552).

Almost surely, 2^66603319313 is an apocalyptic number.

It is an amenable number.

66603319313 is a deficient number, since it is larger than the sum of its proper divisors (214158895).

66603319313 is a wasteful number, since it uses less digits than its factorization.

66603319313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214158894.

The product of its (nonzero) digits is 157464, while the sum is 41.

Adding to 66603319313 its reverse (31391330666), we get a palindrome (97994649979).

The spelling of 66603319313 in words is "sixty-six billion, six hundred three million, three hundred nineteen thousand, three hundred thirteen".