668052571 has 2 divisors, whose sum is σ = 668052572. Its totient is φ = 668052570.

The previous prime is 668052557. The next prime is 668052577. The reversal of 668052571 is 175250866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668052571 - 2⁷ = 668052443 is a prime.

It is not a weakly prime, because it can be changed into another prime (668052577) 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, 334026285 + 334026286.

It is an arithmetic number, because the mean of its divisors is an integer number (334026286).

Almost surely, 2^668052571 is an apocalyptic number.

668052571 is a deficient number, since it is larger than the sum of its proper divisors (1).

668052571 is an equidigital number, since it uses as much as digits as its factorization.

668052571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 668052571 is about 25846.7129631603. The cubic root of 668052571 is about 874.1853952177.

The spelling of 668052571 in words is "six hundred sixty-eight million, fifty-two thousand, five hundred seventy-one".