66231871 has 2 divisors, whose sum is σ = 66231872. Its totient is φ = 66231870.

The previous prime is 66231857. The next prime is 66231877. The reversal of 66231871 is 17813266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66231871 - 2¹⁵ = 66199103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66231877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33115935 + 33115936.

It is an arithmetic number, because the mean of its divisors is an integer number (33115936).

Almost surely, 2^66231871 is an apocalyptic number.

66231871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66231871 is an equidigital number, since it uses as much as digits as its factorization.

66231871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 66231871 is about 8138.2965662355. The cubic root of 66231871 is about 404.5967046677.

The spelling of 66231871 in words is "sixty-six million, two hundred thirty-one thousand, eight hundred seventy-one".