81802715418032 has 80 divisors (see below), whose sum is σ = 189213461706240. Its totient is φ = 33497934514176.

The previous prime is 81802715418023. The next prime is 81802715418041. The reversal of 81802715418032 is 23081451720818.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81802715418023) and next prime (81802715418041).

It is an unprimeable number.

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, 14698238 + ... + 19484445.

It is an arithmetic number, because the mean of its divisors is an integer number (2365168271328).

Almost surely, 2^{81802715418032} is an apocalyptic number.

It is an amenable number.

81802715418032 is an abundant number, since it is smaller than the sum of its proper divisors (107410746288208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81802715418032 is a wasteful number, since it uses less digits than its factorization.

81802715418032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34183650 (or 34183644 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 81802715418032 in words is "eighty-one trillion, eight hundred two billion, seven hundred fifteen million, four hundred eighteen thousand, thirty-two".