81505762075 has 12 divisors (see below), whose sum is σ = 101224835928. Its totient is φ = 65102873600.

The previous prime is 81505762073. The next prime is 81505762099. The reversal of 81505762075 is 57026750518.

It is not a de Polignac number, because 81505762075 - 2¹ = 81505762073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81505762073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2527057 + ... + 2559106.

It is an arithmetic number, because the mean of its divisors is an integer number (8435402994).

Almost surely, 2^81505762075 is an apocalyptic number.

81505762075 is a deficient number, since it is larger than the sum of its proper divisors (19719073853).

81505762075 is a wasteful number, since it uses less digits than its factorization.

81505762075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5086814 (or 5086809 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 46.

The spelling of 81505762075 in words is "eighty-one billion, five hundred five million, seven hundred sixty-two thousand, seventy-five".