66789497 has 2 divisors, whose sum is σ = 66789498. Its totient is φ = 66789496.

The previous prime is 66789473. The next prime is 66789517. The reversal of 66789497 is 79498766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51897616 + 14891881 = 7204^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 66789497 - 2⁸ = 66789241 is a prime.

It is not a weakly prime, because it can be changed into another prime (66789197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33394748 + 33394749.

It is an arithmetic number, because the mean of its divisors is an integer number (33394749).

Almost surely, 2^66789497 is an apocalyptic number.

It is an amenable number.

66789497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66789497 is an equidigital number, since it uses as much as digits as its factorization.

66789497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 56.

The square root of 66789497 is about 8172.4841388650. The cubic root of 66789497 is about 405.7290065542.

The spelling of 66789497 in words is "sixty-six million, seven hundred eighty-nine thousand, four hundred ninety-seven".