20540776033961 has 2 divisors, whose sum is σ = 20540776033962. Its totient is φ = 20540776033960.

The previous prime is 20540776033919. The next prime is 20540776033963. The reversal of 20540776033961 is 16933067704502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18977916013225 + 1562860020736 = 4356365^2 + 1250144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540776033961 - 2²² = 20540771839657 is a prime.

Together with 20540776033963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20540776033963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270388016980 + 10270388016981.

It is an arithmetic number, because the mean of its divisors is an integer number (10270388016981).

Almost surely, 2^{20540776033961} is an apocalyptic number.

It is an amenable number.

20540776033961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540776033961 is an equidigital number, since it uses as much as digits as its factorization.

20540776033961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 53.

The spelling of 20540776033961 in words is "twenty trillion, five hundred forty billion, seven hundred seventy-six million, thirty-three thousand, nine hundred sixty-one".