66603871 has 2 divisors, whose sum is σ = 66603872. Its totient is φ = 66603870.

The previous prime is 66603839. The next prime is 66603877. The reversal of 66603871 is 17830666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66603871 - 2⁵ = 66603839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66603871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66603877) 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, 33301935 + 33301936.

It is an arithmetic number, because the mean of its divisors is an integer number (33301936).

Almost surely, 2^66603871 is an apocalyptic number.

66603871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66603871 is an equidigital number, since it uses as much as digits as its factorization.

66603871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66603871 is about 8161.1194697786. The cubic root of 66603871 is about 405.3527810677.

The spelling of 66603871 in words is "sixty-six million, six hundred three thousand, eight hundred seventy-one".