47171865385557 has 128 divisors (see below), whose sum is σ = 78408489369600. Its totient is φ = 27783574776000.

The previous prime is 47171865385553. The next prime is 47171865385577. The reversal of 47171865385557 is 75558356817174.

47171865385557 is a `hidden beast` number, since 4 + 7 + 1 + 7 + 1 + 8 + 65 + 3 + 8 + 5 + 557 = 666.

It is not a de Polignac number, because 47171865385557 - 2² = 47171865385553 is a prime.

It is a super-2 number, since 2×47171865385557² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47171865385553) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8724218748 + ... + 8724224154.

It is an arithmetic number, because the mean of its divisors is an integer number (612566323200).

Almost surely, 2^{47171865385557} is an apocalyptic number.

47171865385557 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

47171865385557 is a deficient number, since it is larger than the sum of its proper divisors (31236623984043).

47171865385557 is a wasteful number, since it uses less digits than its factorization.

47171865385557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764 (or 9758 counting only the distinct ones).

The product of its digits is 987840000, while the sum is 72.

The spelling of 47171865385557 in words is "forty-seven trillion, one hundred seventy-one billion, eight hundred sixty-five million, three hundred eighty-five thousand, five hundred fifty-seven".