66488413 has 2 divisors, whose sum is σ = 66488414. Its totient is φ = 66488412.

The previous prime is 66488407. The next prime is 66488431. The reversal of 66488413 is 31488466.

Together with next prime (66488431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66292164 + 196249 = 8142^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 66488413 - 2⁵ = 66488381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66488453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33244206 + 33244207.

It is an arithmetic number, because the mean of its divisors is an integer number (33244207).

Almost surely, 2^66488413 is an apocalyptic number.

It is an amenable number.

66488413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66488413 is an equidigital number, since it uses as much as digits as its factorization.

66488413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 40.

The square root of 66488413 is about 8154.0427396476. The cubic root of 66488413 is about 405.1184188597.

The spelling of 66488413 in words is "sixty-six million, four hundred eighty-eight thousand, four hundred thirteen".