66513323131 has 2 divisors, whose sum is σ = 66513323132. Its totient is φ = 66513323130.

The previous prime is 66513323117. The next prime is 66513323141. The reversal of 66513323131 is 13132331566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66513323131 - 2²⁹ = 65976452219 is a prime.

It is a super-2 number, since 2×66513323131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66513323141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256661565 + 33256661566.

It is an arithmetic number, because the mean of its divisors is an integer number (33256661566).

Almost surely, 2^66513323131 is an apocalyptic number.

66513323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513323131 is an equidigital number, since it uses as much as digits as its factorization.

66513323131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 34.

Adding to 66513323131 its reverse (13132331566), we get a palindrome (79645654697).

The spelling of 66513323131 in words is "sixty-six billion, five hundred thirteen million, three hundred twenty-three thousand, one hundred thirty-one".