2911981426561 has 2 divisors, whose sum is σ = 2911981426562. Its totient is φ = 2911981426560.

The previous prime is 2911981426489. The next prime is 2911981426567. The reversal of 2911981426561 is 1656241891192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2610344310336 + 301637116225 = 1615656^2 + 549215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2911981426561 - 2⁷ = 2911981426433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2911981426567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1455990713280 + 1455990713281.

It is an arithmetic number, because the mean of its divisors is an integer number (1455990713281).

Almost surely, 2^{2911981426561} is an apocalyptic number.

It is an amenable number.

2911981426561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2911981426561 is an equidigital number, since it uses as much as digits as its factorization.

2911981426561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 55.

The spelling of 2911981426561 in words is "two trillion, nine hundred eleven billion, nine hundred eighty-one million, four hundred twenty-six thousand, five hundred sixty-one".