660194491571 has 2 divisors, whose sum is σ = 660194491572. Its totient is φ = 660194491570.

The previous prime is 660194491501. The next prime is 660194491591. The reversal of 660194491571 is 175194491066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660194491571 - 2¹⁰ = 660194490547 is a prime.

It is not a weakly prime, because it can be changed into another prime (660194491501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330097245785 + 330097245786.

It is an arithmetic number, because the mean of its divisors is an integer number (330097245786).

Almost surely, 2^660194491571 is an apocalyptic number.

660194491571 is a deficient number, since it is larger than the sum of its proper divisors (1).

660194491571 is an equidigital number, since it uses as much as digits as its factorization.

660194491571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 660194491571 in words is "six hundred sixty billion, one hundred ninety-four million, four hundred ninety-one thousand, five hundred seventy-one".