2756873381681 has 2 divisors, whose sum is σ = 2756873381682. Its totient is φ = 2756873381680.

The previous prime is 2756873381677. The next prime is 2756873381711. The reversal of 2756873381681 is 1861833786572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1765337395600 + 991535986081 = 1328660^2 + 995759^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756873381681 - 2² = 2756873381677 is a prime.

It is a super-2 number, since 2×2756873381681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2756873381611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378436690840 + 1378436690841.

It is an arithmetic number, because the mean of its divisors is an integer number (1378436690841).

Almost surely, 2^{2756873381681} is an apocalyptic number.

It is an amenable number.

2756873381681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756873381681 is an equidigital number, since it uses as much as digits as its factorization.

2756873381681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 65.

The spelling of 2756873381681 in words is "two trillion, seven hundred fifty-six billion, eight hundred seventy-three million, three hundred eighty-one thousand, six hundred eighty-one".