666455497 has 2 divisors, whose sum is σ = 666455498. Its totient is φ = 666455496.

The previous prime is 666455459. The next prime is 666455509. The reversal of 666455497 is 794554666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665072521 + 1382976 = 25789^2 + 1176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666455497 is a prime.

It is not a weakly prime, because it can be changed into another prime (666455597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333227748 + 333227749.

It is an arithmetic number, because the mean of its divisors is an integer number (333227749).

Almost surely, 2^666455497 is an apocalyptic number.

It is an amenable number.

666455497 is a deficient number, since it is larger than the sum of its proper divisors (1).

666455497 is an equidigital number, since it uses as much as digits as its factorization.

666455497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 52.

The square root of 666455497 is about 25815.7993678290. The cubic root of 666455497 is about 873.4882181480.

The spelling of 666455497 in words is "six hundred sixty-six million, four hundred fifty-five thousand, four hundred ninety-seven".