66449497 has 2 divisors, whose sum is σ = 66449498. Its totient is φ = 66449496.

The previous prime is 66449437. The next prime is 66449533. The reversal of 66449497 is 79494466.

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., 57592921 + 8856576 = 7589^2 + 2976^2 .

It is a cyclic number.

It is not a de Polignac number, because 66449497 - 2¹⁵ = 66416729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66449497.

It is not a weakly prime, because it can be changed into another prime (66449437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33224748 + 33224749.

It is an arithmetic number, because the mean of its divisors is an integer number (33224749).

Almost surely, 2^66449497 is an apocalyptic number.

It is an amenable number.

66449497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66449497 is an equidigital number, since it uses as much as digits as its factorization.

66449497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 66449497 is about 8151.6560894091. The cubic root of 66449497 is about 405.0393641564.

The spelling of 66449497 in words is "sixty-six million, four hundred forty-nine thousand, four hundred ninety-seven".