647771243265 has 24 divisors (see below), whose sum is σ = 1123163489448. Its totient is φ = 345367226880.

The previous prime is 647771243257. The next prime is 647771243269. The reversal of 647771243265 is 562342177746.

647771243265 is a `hidden beast` number, since 6 + 4 + 77 + 71 + 243 + 265 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19837032336 + 627934210929 = 140844^2 + 792423^2 .

It is not a de Polignac number, because 647771243265 - 2³ = 647771243257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647771243269) 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, 2165694 + ... + 2446583.

It is an arithmetic number, because the mean of its divisors is an integer number (46798478727).

Almost surely, 2^647771243265 is an apocalyptic number.

It is an amenable number.

647771243265 is a deficient number, since it is larger than the sum of its proper divisors (475392246183).

647771243265 is a wasteful number, since it uses less digits than its factorization.

647771243265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615409 (or 4615406 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 54.

The spelling of 647771243265 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, two hundred sixty-five".