127690636985 has 16 divisors (see below), whose sum is σ = 153626115216. Its totient is φ = 101887746048.

The previous prime is 127690636937. The next prime is 127690636987. The reversal of 127690636985 is 589636096721.

It can be written as a sum of positive squares in 8 ways, for example, as 518518441 + 127172118544 = 22771^2 + 356612^2 .

It is a cyclic number.

It is not a de Polignac number, because 127690636985 - 2⁶ = 127690636921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127690636987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10985897 + ... + 10997513.

It is an arithmetic number, because the mean of its divisors is an integer number (9601632201).

Almost surely, 2^127690636985 is an apocalyptic number.

It is an amenable number.

127690636985 is a deficient number, since it is larger than the sum of its proper divisors (25935478231).

127690636985 is a wasteful number, since it uses less digits than its factorization.

127690636985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17132.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 127690636985 in words is "one hundred twenty-seven billion, six hundred ninety million, six hundred thirty-six thousand, nine hundred eighty-five".