66198787 has 2 divisors, whose sum is σ = 66198788. Its totient is φ = 66198786.

The previous prime is 66198757. The next prime is 66198791. The reversal of 66198787 is 78789166.

66198787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66198787 - 2⁷ = 66198659 is a prime.

It is not a weakly prime, because it can be changed into another prime (66198707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33099393 + 33099394.

It is an arithmetic number, because the mean of its divisors is an integer number (33099394).

Almost surely, 2^66198787 is an apocalyptic number.

66198787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66198787 is an equidigital number, since it uses as much as digits as its factorization.

66198787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 66198787 is about 8136.2637002496. The cubic root of 66198787 is about 404.5293256924.

The spelling of 66198787 in words is "sixty-six million, one hundred ninety-eight thousand, seven hundred eighty-seven".