66415529 has 2 divisors, whose sum is σ = 66415530. Its totient is φ = 66415528.

The previous prime is 66415511. The next prime is 66415541. The reversal of 66415529 is 92551466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34515625 + 31899904 = 5875^2 + 5648^2 .

It is a cyclic number.

It is not a de Polignac number, because 66415529 - 2⁸ = 66415273 is a prime.

It is a super-2 number, since 2×66415529² = 8822044984699682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66415492 and 66415501.

It is not a weakly prime, because it can be changed into another prime (66415589) 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, 33207764 + 33207765.

It is an arithmetic number, because the mean of its divisors is an integer number (33207765).

Almost surely, 2^66415529 is an apocalyptic number.

It is an amenable number.

66415529 is a deficient number, since it is larger than the sum of its proper divisors (1).

66415529 is an equidigital number, since it uses as much as digits as its factorization.

66415529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 66415529 is about 8149.5723200669. The cubic root of 66415529 is about 404.9703356823.

The spelling of 66415529 in words is "sixty-six million, four hundred fifteen thousand, five hundred twenty-nine".