127866669665 has 16 divisors (see below), whose sum is σ = 175417031808. Its totient is φ = 87651488256.

The previous prime is 127866669653. The next prime is 127866669673. The reversal of 127866669665 is 566966668721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 127866669665 - 2⁸ = 127866669409 is a prime.

It is a super-2 number, since 2×127866669665² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 127866669595 and 127866669604.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484592 + ... + 700401.

It is an arithmetic number, because the mean of its divisors is an integer number (10963564488).

Almost surely, 2^127866669665 is an apocalyptic number.

It is an amenable number.

127866669665 is a deficient number, since it is larger than the sum of its proper divisors (47550362143).

127866669665 is a wasteful number, since it uses less digits than its factorization.

127866669665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188088.

The product of its digits is 235146240, while the sum is 68.

The spelling of 127866669665 in words is "one hundred twenty-seven billion, eight hundred sixty-six million, six hundred sixty-nine thousand, six hundred sixty-five".