66276491 has 2 divisors, whose sum is σ = 66276492. Its totient is φ = 66276490.

The previous prime is 66276449. The next prime is 66276499. The reversal of 66276491 is 19467266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66276491 - 2¹⁴ = 66260107 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66276499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33138245 + 33138246.

It is an arithmetic number, because the mean of its divisors is an integer number (33138246).

Almost surely, 2^66276491 is an apocalyptic number.

66276491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66276491 is an equidigital number, since it uses as much as digits as its factorization.

66276491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 66276491 is about 8141.0374645987. The cubic root of 66276491 is about 404.6875423672.

The spelling of 66276491 in words is "sixty-six million, two hundred seventy-six thousand, four hundred ninety-one".