66325013 has 6 divisors (see below), whose sum is σ = 66635874. Its totient is φ = 66015456.

The previous prime is 66324997. The next prime is 66325019. The reversal of 66325013 is 31052366.

It can be written as a sum of positive squares in 3 ways, for example, as 114244 + 66210769 = 338^2 + 8137^2 .

It is not a de Polignac number, because 66325013 - 2⁴ = 66324997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66325019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 97631 + ... + 98307.

It is an arithmetic number, because the mean of its divisors is an integer number (11105979).

Almost surely, 2^66325013 is an apocalyptic number.

It is an amenable number.

66325013 is a deficient number, since it is larger than the sum of its proper divisors (310861).

66325013 is an frugal number, since it uses more digits than its factorization.

66325013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 66325013 is about 8144.0170063673. The cubic root of 66325013 is about 404.7862775224.

Adding to 66325013 its reverse (31052366), we get a palindrome (97377379).

The spelling of 66325013 in words is "sixty-six million, three hundred twenty-five thousand, thirteen".