2641205912981 has 2 divisors, whose sum is σ = 2641205912982. Its totient is φ = 2641205912980.

The previous prime is 2641205912957. The next prime is 2641205912987. The reversal of 2641205912981 is 1892195021462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1738154828881 + 903051084100 = 1318391^2 + 950290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2641205912981 is a prime.

It is a super-2 number, since 2×2641205912981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2641205912987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320602956490 + 1320602956491.

It is an arithmetic number, because the mean of its divisors is an integer number (1320602956491).

Almost surely, 2^{2641205912981} is an apocalyptic number.

It is an amenable number.

2641205912981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2641205912981 is an equidigital number, since it uses as much as digits as its factorization.

2641205912981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 2641205912981 in words is "two trillion, six hundred forty-one billion, two hundred five million, nine hundred twelve thousand, nine hundred eighty-one".