66485491 has 2 divisors, whose sum is σ = 66485492. Its totient is φ = 66485490.

The previous prime is 66485459. The next prime is 66485501. The reversal of 66485491 is 19458466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66485491 - 2⁵ = 66485459 is a prime.

It is a super-2 number, since 2×66485491² = 8840641027022162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66485431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33242745 + 33242746.

It is an arithmetic number, because the mean of its divisors is an integer number (33242746).

Almost surely, 2^66485491 is an apocalyptic number.

66485491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66485491 is an equidigital number, since it uses as much as digits as its factorization.

66485491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 66485491 is about 8153.8635627535. The cubic root of 66485491 is about 405.1124841245.

The spelling of 66485491 in words is "sixty-six million, four hundred eighty-five thousand, four hundred ninety-one".