127865665665 has 96 divisors (see below), whose sum is σ = 251755620480. Its totient is φ = 61970033664.

The previous prime is 127865665651. The next prime is 127865665727. The reversal of 127865665665 is 566566568721.

127865665665 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 6 + 5 + 66 + 566 + 5 = 666.

It is not a de Polignac number, because 127865665665 - 2⁴ = 127865665649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 492262 + ... + 705728.

It is an arithmetic number, because the mean of its divisors is an integer number (2622454380).

Almost surely, 2^127865665665 is an apocalyptic number.

127865665665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

127865665665 is a deficient number, since it is larger than the sum of its proper divisors (123889954815).

127865665665 is a wasteful number, since it uses less digits than its factorization.

127865665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213533 (or 213521 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 63.

The spelling of 127865665665 in words is "one hundred twenty-seven billion, eight hundred sixty-five million, six hundred sixty-five thousand, six hundred sixty-five".