81265812058811 has 2 divisors, whose sum is σ = 81265812058812. Its totient is φ = 81265812058810.

The previous prime is 81265812058807. The next prime is 81265812058813. The reversal of 81265812058811 is 11885021856218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81265812058811 - 2² = 81265812058807 is a prime.

Together with 81265812058813, 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 (81265812058813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40632906029405 + 40632906029406.

It is an arithmetic number, because the mean of its divisors is an integer number (40632906029406).

Almost surely, 2^{81265812058811} is an apocalyptic number.

81265812058811 is a deficient number, since it is larger than the sum of its proper divisors (1).

81265812058811 is an equidigital number, since it uses as much as digits as its factorization.

81265812058811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2457600, while the sum is 56.

The spelling of 81265812058811 in words is "eighty-one trillion, two hundred sixty-five billion, eight hundred twelve million, fifty-eight thousand, eight hundred eleven".