5127705665 has 32 divisors (see below), whose sum is σ = 6599970720. Its totient is φ = 3810852864.

The previous prime is 5127705647. The next prime is 5127705677. The reversal of 5127705665 is 5665077215.

It is a Cunningham number, because it is equal to 71608²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 188567824 + 4939137841 = 13732^2 + 70279^2 .

It is a cyclic number.

It is not a de Polignac number, because 5127705665 - 2¹⁶ = 5127640129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4690859 + ... + 4691951.

It is an arithmetic number, because the mean of its divisors is an integer number (206249085).

Almost surely, 2^5127705665 is an apocalyptic number.

It is an amenable number.

5127705665 is a deficient number, since it is larger than the sum of its proper divisors (1472265055).

5127705665 is a wasteful number, since it uses less digits than its factorization.

5127705665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its (nonzero) digits is 441000, while the sum is 44.

The square root of 5127705665 is about 71608.0000069825. Note that the first 5 decimals coincide. The cubic root of 5127705665 is about 1724.4119723655.

The spelling of 5127705665 in words is "five billion, one hundred twenty-seven million, seven hundred five thousand, six hundred sixty-five".