47171865585557 has 2 divisors, whose sum is σ = 47171865585558. Its totient is φ = 47171865585556.

The previous prime is 47171865585553. The next prime is 47171865585563. The reversal of 47171865585557 is 75558556817174.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45422936039716 + 1748929545841 = 6739654^2 + 1322471^2 .

It is a cyclic number.

It is not a de Polignac number, because 47171865585557 - 2² = 47171865585553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47171865585553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23585932792778 + 23585932792779.

It is an arithmetic number, because the mean of its divisors is an integer number (23585932792779).

Almost surely, 2^{47171865585557} is an apocalyptic number.

It is an amenable number.

47171865585557 is a deficient number, since it is larger than the sum of its proper divisors (1).

47171865585557 is an equidigital number, since it uses as much as digits as its factorization.

47171865585557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400000, while the sum is 74.

The spelling of 47171865585557 in words is "forty-seven trillion, one hundred seventy-one billion, eight hundred sixty-five million, five hundred eighty-five thousand, five hundred fifty-seven".