127997967877 has 18 divisors (see below), whose sum is σ = 140026593714. Its totient is φ = 116309920320.

The previous prime is 127997967871. The next prime is 127997967883. The reversal of 127997967877 is 778769799721.

It is an interprime number because it is at equal distance from previous prime (127997967871) and next prime (127997967883).

It can be written as a sum of positive squares in 3 ways, for example, as 1997106721 + 126000861156 = 44689^2 + 354966^2 .

It is not a de Polignac number, because 127997967877 - 2²⁷ = 127863750149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127997967797 and 127997967806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127997967871) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 86425977 + ... + 86427457.

Almost surely, 2^127997967877 is an apocalyptic number.

It is an amenable number.

127997967877 is a deficient number, since it is larger than the sum of its proper divisors (12028625837).

127997967877 is an frugal number, since it uses more digits than its factorization.

127997967877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 1561 counting only the distinct ones).

The product of its digits is 1176221088, while the sum is 79.

The spelling of 127997967877 in words is "one hundred twenty-seven billion, nine hundred ninety-seven million, nine hundred sixty-seven thousand, eight hundred seventy-seven".