66337591 has 2 divisors, whose sum is σ = 66337592. Its totient is φ = 66337590.

The previous prime is 66337573. The next prime is 66337597. The reversal of 66337591 is 19573366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66337591 - 2¹¹ = 66335543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66337597) 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, 33168795 + 33168796.

It is an arithmetic number, because the mean of its divisors is an integer number (33168796).

Almost surely, 2^66337591 is an apocalyptic number.

66337591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66337591 is an equidigital number, since it uses as much as digits as its factorization.

66337591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 40.

The square root of 66337591 is about 8144.7891930976. The cubic root of 66337591 is about 404.8118640483.

The spelling of 66337591 in words is "sixty-six million, three hundred thirty-seven thousand, five hundred ninety-one".