127751961685 has 4 divisors (see below), whose sum is σ = 153302354028. Its totient is φ = 102201569344.

The previous prime is 127751961643. The next prime is 127751961719. The reversal of 127751961685 is 586169157721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14883512004 + 112868449681 = 121998^2 + 335959^2 .

It is a cyclic number.

It is not a de Polignac number, because 127751961685 - 2³¹ = 125604478037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12775196164 + ... + 12775196173.

It is an arithmetic number, because the mean of its divisors is an integer number (38325588507).

Almost surely, 2^127751961685 is an apocalyptic number.

It is an amenable number.

127751961685 is a deficient number, since it is larger than the sum of its proper divisors (25550392343).

127751961685 is an equidigital number, since it uses as much as digits as its factorization.

127751961685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25550392342.

The product of its digits is 6350400, while the sum is 58.

The spelling of 127751961685 in words is "one hundred twenty-seven billion, seven hundred fifty-one million, nine hundred sixty-one thousand, six hundred eighty-five".