47171865385577 has 2 divisors, whose sum is σ = 47171865385578. Its totient is φ = 47171865385576.

The previous prime is 47171865385553. The next prime is 47171865385639. The reversal of 47171865385577 is 77558356817174.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42390204122176 + 4781661263401 = 6510776^2 + 2186701^2 .

It is a cyclic number.

It is not a de Polignac number, because 47171865385577 - 2¹⁸ = 47171865123433 is a prime.

It is not a weakly prime, because it can be changed into another prime (47171865385517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23585932692788 + 23585932692789.

It is an arithmetic number, because the mean of its divisors is an integer number (23585932692789).

Almost surely, 2^{47171865385577} is an apocalyptic number.

It is an amenable number.

47171865385577 is a deficient number, since it is larger than the sum of its proper divisors (1).

47171865385577 is an equidigital number, since it uses as much as digits as its factorization.

47171865385577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976000, while the sum is 74.

The spelling of 47171865385577 in words is "forty-seven trillion, one hundred seventy-one billion, eight hundred sixty-five million, three hundred eighty-five thousand, five hundred seventy-seven".