127773580777 has 4 divisors (see below), whose sum is σ = 131226920836. Its totient is φ = 124320240720.

The previous prime is 127773580729. The next prime is 127773580843. The reversal of 127773580777 is 777085377721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 777085377721 = 191 ⋅4068509831.

It can be written as a sum of positive squares in 2 ways, for example, as 112371777961 + 15401802816 = 335219^2 + 124104^2 .

It is a cyclic number.

It is not a de Polignac number, because 127773580777 - 2¹¹ = 127773578729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127773580577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1726669974 + ... + 1726670047.

It is an arithmetic number, because the mean of its divisors is an integer number (32806730209).

Almost surely, 2^127773580777 is an apocalyptic number.

It is an amenable number.

127773580777 is a deficient number, since it is larger than the sum of its proper divisors (3453340059).

127773580777 is an equidigital number, since it uses as much as digits as its factorization.

127773580777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453340058.

The product of its (nonzero) digits is 28235760, while the sum is 61.

The spelling of 127773580777 in words is "one hundred twenty-seven billion, seven hundred seventy-three million, five hundred eighty thousand, seven hundred seventy-seven".