1666895638327 has 2 divisors, whose sum is σ = 1666895638328. Its totient is φ = 1666895638326.

The previous prime is 1666895638313. The next prime is 1666895638351. The reversal of 1666895638327 is 7238365986661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666895638327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666895638367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833447819163 + 833447819164.

It is an arithmetic number, because the mean of its divisors is an integer number (833447819164).

Almost surely, 2^{1666895638327} is an apocalyptic number.

1666895638327 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666895638327 is an equidigital number, since it uses as much as digits as its factorization.

1666895638327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 70.

The spelling of 1666895638327 in words is "one trillion, six hundred sixty-six billion, eight hundred ninety-five million, six hundred thirty-eight thousand, three hundred twenty-seven".