66353789 has 2 divisors, whose sum is σ = 66353790. Its totient is φ = 66353788.

The previous prime is 66353767. The next prime is 66353797. The reversal of 66353789 is 98735366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 27478564 = 6235^2 + 5242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66353789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66350789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33176894 + 33176895.

It is an arithmetic number, because the mean of its divisors is an integer number (33176895).

Almost surely, 2^66353789 is an apocalyptic number.

It is an amenable number.

66353789 is a deficient number, since it is larger than the sum of its proper divisors (1).

66353789 is an equidigital number, since it uses as much as digits as its factorization.

66353789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 66353789 is about 8145.7835105041. The cubic root of 66353789 is about 404.8448097173.

The spelling of 66353789 in words is "sixty-six million, three hundred fifty-three thousand, seven hundred eighty-nine".