66361583 has 2 divisors, whose sum is σ = 66361584. Its totient is φ = 66361582.

The previous prime is 66361577. The next prime is 66361597. The reversal of 66361583 is 38516366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66361583 - 2¹⁴ = 66345199 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66361553) 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, 33180791 + 33180792.

It is an arithmetic number, because the mean of its divisors is an integer number (33180792).

Almost surely, 2^66361583 is an apocalyptic number.

66361583 is a deficient number, since it is larger than the sum of its proper divisors (1).

66361583 is an equidigital number, since it uses as much as digits as its factorization.

66361583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 66361583 is about 8146.2619034745. The cubic root of 66361583 is about 404.8606602912.

The spelling of 66361583 in words is "sixty-six million, three hundred sixty-one thousand, five hundred eighty-three".