81810636096 has 112 divisors (see below), whose sum is σ = 247744756224. Its totient is φ = 23339982336.

The previous prime is 81810636079. The next prime is 81810636113. The reversal of 81810636096 is 69063601818.

It is an interprime number because it is at equal distance from previous prime (81810636079) and next prime (81810636113).

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873391 + ... + 962513.

It is an arithmetic number, because the mean of its divisors is an integer number (2212006752).

Almost surely, 2^81810636096 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 81810636096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123872378112).

81810636096 is an abundant number, since it is smaller than the sum of its proper divisors (165934120128).

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

81810636096 is a wasteful number, since it uses less digits than its factorization.

81810636096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89828 (or 89818 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 81810636096 in words is "eighty-one billion, eight hundred ten million, six hundred thirty-six thousand, ninety-six".