127775066561 has 8 divisors (see below), whose sum is σ = 128447295240. Its totient is φ = 127102943232.

The previous prime is 127775066501. The next prime is 127775066609. The reversal of 127775066561 is 165660577721.

It can be written as a sum of positive squares in 4 ways, for example, as 83625072400 + 44149994161 = 289180^2 + 210119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127775066561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127775066501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4054481 + ... + 4085873.

It is an arithmetic number, because the mean of its divisors is an integer number (16055911905).

Almost surely, 2^127775066561 is an apocalyptic number.

It is an amenable number.

127775066561 is a deficient number, since it is larger than the sum of its proper divisors (672228679).

127775066561 is a wasteful number, since it uses less digits than its factorization.

127775066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52675.

The product of its (nonzero) digits is 3704400, while the sum is 53.

The spelling of 127775066561 in words is "one hundred twenty-seven billion, seven hundred seventy-five million, sixty-six thousand, five hundred sixty-one".