81630162208 has 96 divisors (see below), whose sum is σ = 187209114624. Its totient is φ = 34316255232.

The previous prime is 81630162203. The next prime is 81630162221. The reversal of 81630162208 is 80226103618.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81630162203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2438641 + ... + 2471887.

It is an arithmetic number, because the mean of its divisors is an integer number (1950094944).

Almost surely, 2^81630162208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81630162208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93604557312).

81630162208 is an abundant number, since it is smaller than the sum of its proper divisors (105578952416).

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

81630162208 is a wasteful number, since it uses less digits than its factorization.

81630162208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33474 (or 33466 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 81630162208 in words is "eighty-one billion, six hundred thirty million, one hundred sixty-two thousand, two hundred eight".