66117589 has 2 divisors, whose sum is σ = 66117590. Its totient is φ = 66117588.

The previous prime is 66117559. The next prime is 66117599. The reversal of 66117589 is 98571166.

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., 58599025 + 7518564 = 7655^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 66117589 - 2¹¹ = 66115541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66117509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058794 + 33058795.

It is an arithmetic number, because the mean of its divisors is an integer number (33058795).

Almost surely, 2^66117589 is an apocalyptic number.

It is an amenable number.

66117589 is a deficient number, since it is larger than the sum of its proper divisors (1).

66117589 is an equidigital number, since it uses as much as digits as its factorization.

66117589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 66117589 is about 8131.2722866720. The cubic root of 66117589 is about 404.3638623829.

The spelling of 66117589 in words is "sixty-six million, one hundred seventeen thousand, five hundred eighty-nine".