66513113 has 2 divisors, whose sum is σ = 66513114. Its totient is φ = 66513112.

The previous prime is 66513107. The next prime is 66513121. The reversal of 66513113 is 31131566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 529984 = 8123^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 66513113 - 2⁶ = 66513049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66513143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256556 + 33256557.

It is an arithmetic number, because the mean of its divisors is an integer number (33256557).

Almost surely, 2^66513113 is an apocalyptic number.

It is an amenable number.

66513113 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513113 is an equidigital number, since it uses as much as digits as its factorization.

66513113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 66513113 is about 8155.5571851346. The cubic root of 66513113 is about 405.1685789083.

Adding to 66513113 its reverse (31131566), we get a palindrome (97644679).

The spelling of 66513113 in words is "sixty-six million, five hundred thirteen thousand, one hundred thirteen".