66597887 has 2 divisors, whose sum is σ = 66597888. Its totient is φ = 66597886.

The previous prime is 66597877. The next prime is 66597893. The reversal of 66597887 is 78879566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66597887 - 2⁴ = 66597871 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66597847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33298943 + 33298944.

It is an arithmetic number, because the mean of its divisors is an integer number (33298944).

Almost surely, 2^66597887 is an apocalyptic number.

66597887 is a deficient number, since it is larger than the sum of its proper divisors (1).

66597887 is an equidigital number, since it uses as much as digits as its factorization.

66597887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 56.

The square root of 66597887 is about 8160.7528451730. The cubic root of 66597887 is about 405.3406411142.

The spelling of 66597887 in words is "sixty-six million, five hundred ninety-seven thousand, eight hundred eighty-seven".