127736806781 has 4 divisors (see below), whose sum is σ = 127744332864. Its totient is φ = 127729280700.

The previous prime is 127736806721. The next prime is 127736806811. The reversal of 127736806781 is 187608637721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 127736806781 - 2²⁶ = 127669697917 is a prime.

It is a super-2 number, since 2×127736806781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127736806721) 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, 3737525 + ... + 3771546.

It is an arithmetic number, because the mean of its divisors is an integer number (31936083216).

Almost surely, 2^127736806781 is an apocalyptic number.

It is an amenable number.

127736806781 is a deficient number, since it is larger than the sum of its proper divisors (7526083).

127736806781 is an equidigital number, since it uses as much as digits as its factorization.

127736806781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7526082.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 127736806781 in words is "one hundred twenty-seven billion, seven hundred thirty-six million, eight hundred six thousand, seven hundred eighty-one".