81095424757 has 2 divisors, whose sum is σ = 81095424758. Its totient is φ = 81095424756.

The previous prime is 81095424737. The next prime is 81095424797. The reversal of 81095424757 is 75742459018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52452908676 + 28642516081 = 229026^2 + 169241^2 .

It is a cyclic number.

It is not a de Polignac number, because 81095424757 - 2⁷ = 81095424629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81095424737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40547712378 + 40547712379.

It is an arithmetic number, because the mean of its divisors is an integer number (40547712379).

Almost surely, 2^81095424757 is an apocalyptic number.

It is an amenable number.

81095424757 is a deficient number, since it is larger than the sum of its proper divisors (1).

81095424757 is an equidigital number, since it uses as much as digits as its factorization.

81095424757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 81095424757 in words is "eighty-one billion, ninety-five million, four hundred twenty-four thousand, seven hundred fifty-seven".