66488491 has 2 divisors, whose sum is σ = 66488492. Its totient is φ = 66488490.

The previous prime is 66488489. The next prime is 66488501. The reversal of 66488491 is 19488466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66488491 - 2¹ = 66488489 is a prime.

Together with 66488489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66488431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33244245 + 33244246.

It is an arithmetic number, because the mean of its divisors is an integer number (33244246).

Almost surely, 2^66488491 is an apocalyptic number.

66488491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66488491 is an equidigital number, since it uses as much as digits as its factorization.

66488491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The square root of 66488491 is about 8154.0475225498. The cubic root of 66488491 is about 405.1185772794.

The spelling of 66488491 in words is "sixty-six million, four hundred eighty-eight thousand, four hundred ninety-one".