81102913536 has 120 divisors (see below), whose sum is σ = 225673930944. Its totient is φ = 25858539520.

The previous prime is 81102913531. The next prime is 81102913537. The reversal of 81102913536 is 63531920118.

It is a junction number, because it is equal to n+sod(n) for n = 81102913494 and 81102913503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81102913531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094626 + ... + 1166366.

Almost surely, 2^81102913536 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 81102913536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112836965472).

81102913536 is an abundant number, since it is smaller than the sum of its proper divisors (144571017408).

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

81102913536 is an equidigital number, since it uses as much as digits as its factorization.

81102913536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71795 (or 71769 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 81102913536 in words is "eighty-one billion, one hundred two million, nine hundred thirteen thousand, five hundred thirty-six".