127212572551681 has 4 divisors (see below), whose sum is σ = 129919223031552. Its totient is φ = 124505922071812.

The previous prime is 127212572551679. The next prime is 127212572551699. The reversal of 127212572551681 is 186155275212721.

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 127212572551681 - 2¹ = 127212572551679 is a prime.

It is a super-2 number, since 2×127212572551681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127212572551661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353325239865 + ... + 1353325239958.

It is an arithmetic number, because the mean of its divisors is an integer number (32479805757888).

Almost surely, 2^{127212572551681} is an apocalyptic number.

It is an amenable number.

127212572551681 is a deficient number, since it is larger than the sum of its proper divisors (2706650479871).

127212572551681 is an equidigital number, since it uses as much as digits as its factorization.

127212572551681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706650479870.

The product of its digits is 4704000, while the sum is 55.

The spelling of 127212572551681 in words is "one hundred twenty-seven trillion, two hundred twelve billion, five hundred seventy-two million, five hundred fifty-one thousand, six hundred eighty-one".