66130513 has 2 divisors, whose sum is σ = 66130514. Its totient is φ = 66130512.

The previous prime is 66130511. The next prime is 66130523. The reversal of 66130513 is 31503166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66129424 + 1089 = 8132^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 66130513 - 2¹ = 66130511 is a prime.

Together with 66130511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66130511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33065256 + 33065257.

It is an arithmetic number, because the mean of its divisors is an integer number (33065257).

Almost surely, 2^66130513 is an apocalyptic number.

It is an amenable number.

66130513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66130513 is an equidigital number, since it uses as much as digits as its factorization.

66130513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 66130513 is about 8132.0669574223. The cubic root of 66130513 is about 404.3902076574.

Adding to 66130513 its reverse (31503166), we get a palindrome (97633679).

The spelling of 66130513 in words is "sixty-six million, one hundred thirty thousand, five hundred thirteen".