81593170507 has 2 divisors, whose sum is σ = 81593170508. Its totient is φ = 81593170506.

The previous prime is 81593170433. The next prime is 81593170517. The reversal of 81593170507 is 70507139518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81593170507 - 2²³ = 81584781899 is a prime.

It is not a weakly prime, because it can be changed into another prime (81593170517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40796585253 + 40796585254.

It is an arithmetic number, because the mean of its divisors is an integer number (40796585254).

Almost surely, 2^81593170507 is an apocalyptic number.

81593170507 is a deficient number, since it is larger than the sum of its proper divisors (1).

81593170507 is an equidigital number, since it uses as much as digits as its factorization.

81593170507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 46.

The spelling of 81593170507 in words is "eighty-one billion, five hundred ninety-three million, one hundred seventy thousand, five hundred seven".