66013313 has 4 divisors (see below), whose sum is σ = 66495300. Its totient is φ = 65531328.

The previous prime is 66013307. The next prime is 66013331. The reversal of 66013313 is 31331066.

66013313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55696369 + 10316944 = 7463^2 + 3212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66013313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240788 + ... + 241061.

It is an arithmetic number, because the mean of its divisors is an integer number (16623825).

Almost surely, 2^66013313 is an apocalyptic number.

It is an amenable number.

66013313 is a deficient number, since it is larger than the sum of its proper divisors (481987).

66013313 is a wasteful number, since it uses less digits than its factorization.

66013313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481986.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 66013313 is about 8124.8577218312. The cubic root of 66013313 is about 404.1511724720.

Adding to 66013313 its reverse (31331066), we get a palindrome (97344379).

The spelling of 66013313 in words is "sixty-six million, thirteen thousand, three hundred thirteen".