66086491 has 2 divisors, whose sum is σ = 66086492. Its totient is φ = 66086490.

The previous prime is 66086483. The next prime is 66086533. The reversal of 66086491 is 19468066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66086491 - 2³ = 66086483 is a prime.

It is not a weakly prime, because it can be changed into another prime (66086411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33043245 + 33043246.

It is an arithmetic number, because the mean of its divisors is an integer number (33043246).

Almost surely, 2^66086491 is an apocalyptic number.

66086491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66086491 is an equidigital number, since it uses as much as digits as its factorization.

66086491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 66086491 is about 8129.3598148932. The cubic root of 66086491 is about 404.3004557584.

The spelling of 66086491 in words is "sixty-six million, eighty-six thousand, four hundred ninety-one".