81425145599 has 16 divisors (see below), whose sum is σ = 98577812736. Its totient is φ = 65656483200.

The previous prime is 81425145523. The next prime is 81425145611. The reversal of 81425145599 is 99554152418.

It is a de Polignac number, because none of the positive numbers 2^k-81425145599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81425145599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81425145199) 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 in 15 ways as a sum of consecutive naturals, for example, 93044 + ... + 414134.

It is an arithmetic number, because the mean of its divisors is an integer number (6161113296).

Almost surely, 2^81425145599 is an apocalyptic number.

81425145599 is a deficient number, since it is larger than the sum of its proper divisors (17152667137).

81425145599 is a wasteful number, since it uses less digits than its factorization.

81425145599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323246.

The product of its digits is 2592000, while the sum is 53.

The spelling of 81425145599 in words is "eighty-one billion, four hundred twenty-five million, one hundred forty-five thousand, five hundred ninety-nine".