20127067825681 has 4 divisors (see below), whose sum is σ = 20127398961892. Its totient is φ = 20126736689472.

The previous prime is 20127067825673. The next prime is 20127067825687. The reversal of 20127067825681 is 18652876072102.

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 15541066990656 + 4586000835025 = 3942216^2 + 2141495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20127067825681 - 2³ = 20127067825673 is a prime.

It is a super-2 number, since 2×20127067825681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20127067825687) 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, 165476916 + ... + 165598501.

It is an arithmetic number, because the mean of its divisors is an integer number (5031849740473).

Almost surely, 2^{20127067825681} is an apocalyptic number.

It is an amenable number.

20127067825681 is a deficient number, since it is larger than the sum of its proper divisors (331136211).

20127067825681 is an equidigital number, since it uses as much as digits as its factorization.

20127067825681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331136210.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 20127067825681 in words is "twenty trillion, one hundred twenty-seven billion, sixty-seven million, eight hundred twenty-five thousand, six hundred eighty-one".