81325093499 has 6 divisors (see below), whose sum is σ = 88062083676. Its totient is φ = 75069316920.

The previous prime is 81325093489. The next prime is 81325093523. The reversal of 81325093499 is 99439052318.

It is not a de Polignac number, because 81325093499 - 2¹² = 81325089403 is a prime.

It is a super-2 number, since 2×81325093499² (a number of 23 digits) contains 22 as substring.

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 81325093499.

It is not an unprimeable number, because it can be changed into a prime (81325093489) 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 5 ways as a sum of consecutive naturals, for example, 240606617 + ... + 240606954.

It is an arithmetic number, because the mean of its divisors is an integer number (14677013946).

Almost surely, 2^81325093499 is an apocalyptic number.

81325093499 is a deficient number, since it is larger than the sum of its proper divisors (6736990177).

81325093499 is a wasteful number, since it uses less digits than its factorization.

81325093499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481213597 (or 481213584 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 81325093499 in words is "eighty-one billion, three hundred twenty-five million, ninety-three thousand, four hundred ninety-nine".