647555777271 has 24 divisors (see below), whose sum is σ = 1039802830976. Its totient is φ = 385641155520.

The previous prime is 647555777243. The next prime is 647555777279. The reversal of 647555777271 is 172777555746.

647555777271 is a `hidden beast` number, since 6 + 4 + 7 + 5 + 557 + 7 + 7 + 2 + 71 = 666.

647555777271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647555777271 - 2¹³ = 647555769079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647555777199 and 647555777208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647555777279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89265160 + ... + 89272413.

Almost surely, 2^647555777271 is an apocalyptic number.

647555777271 is a deficient number, since it is larger than the sum of its proper divisors (392247053705).

647555777271 is a wasteful number, since it uses less digits than its factorization.

647555777271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178537623 (or 178537620 counting only the distinct ones).

The product of its digits is 100842000, while the sum is 63.

The spelling of 647555777271 in words is "six hundred forty-seven billion, five hundred fifty-five million, seven hundred seventy-seven thousand, two hundred seventy-one".