2641421426681 has 2 divisors, whose sum is σ = 2641421426682. Its totient is φ = 2641421426680.

The previous prime is 2641421426647. The next prime is 2641421426701. The reversal of 2641421426681 is 1866241241462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2203395859456 + 438025567225 = 1484384^2 + 661835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2641421426681 - 2⁶ = 2641421426617 is a prime.

It is a super-2 number, since 2×2641421426681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2641421426621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320710713340 + 1320710713341.

It is an arithmetic number, because the mean of its divisors is an integer number (1320710713341).

Almost surely, 2^{2641421426681} is an apocalyptic number.

It is an amenable number.

2641421426681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2641421426681 is an equidigital number, since it uses as much as digits as its factorization.

2641421426681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 47.

The spelling of 2641421426681 in words is "two trillion, six hundred forty-one billion, four hundred twenty-one million, four hundred twenty-six thousand, six hundred eighty-one".