127856439911 has 2 divisors, whose sum is σ = 127856439912. Its totient is φ = 127856439910.

The previous prime is 127856439899. The next prime is 127856439979. The reversal of 127856439911 is 119934658721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127856439911 - 2¹⁰ = 127856438887 is a prime.

It is a super-3 number, since 3×127856439911³ (a number of 34 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127856439311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63928219955 + 63928219956.

It is an arithmetic number, because the mean of its divisors is an integer number (63928219956).

Almost surely, 2^127856439911 is an apocalyptic number.

127856439911 is a deficient number, since it is larger than the sum of its proper divisors (1).

127856439911 is an equidigital number, since it uses as much as digits as its factorization.

127856439911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The spelling of 127856439911 in words is "one hundred twenty-seven billion, eight hundred fifty-six million, four hundred thirty-nine thousand, nine hundred eleven".