81130658585761 has 2 divisors, whose sum is σ = 81130658585762. Its totient is φ = 81130658585760.

The previous prime is 81130658585681. The next prime is 81130658585849. The reversal of 81130658585761 is 16758585603118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44424557780625 + 36706100805136 = 6665175^2 + 6058556^2 .

It is a cyclic number.

It is not a de Polignac number, because 81130658585761 - 2⁷ = 81130658585633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81130658585693 and 81130658585702.

It is not a weakly prime, because it can be changed into another prime (81130658585461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40565329292880 + 40565329292881.

It is an arithmetic number, because the mean of its divisors is an integer number (40565329292881).

Almost surely, 2^{81130658585761} is an apocalyptic number.

It is an amenable number.

81130658585761 is a deficient number, since it is larger than the sum of its proper divisors (1).

81130658585761 is an equidigital number, since it uses as much as digits as its factorization.

81130658585761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384000, while the sum is 64.

The spelling of 81130658585761 in words is "eighty-one trillion, one hundred thirty billion, six hundred fifty-eight million, five hundred eighty-five thousand, seven hundred sixty-one".