81196235500 has 48 divisors (see below), whose sum is σ = 177607370304. Its totient is φ = 32428166400.

The previous prime is 81196235489. The next prime is 81196235563. The reversal of 81196235500 is 553269118.

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, 198004 + ... + 448996.

It is an arithmetic number, because the mean of its divisors is an integer number (3700153548).

Almost surely, 2^81196235500 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 81196235500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88803685152).

81196235500 is an abundant number, since it is smaller than the sum of its proper divisors (96411134804).

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

81196235500 is a wasteful number, since it uses less digits than its factorization.

81196235500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251659 (or 251647 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 81196235500 in words is "eighty-one billion, one hundred ninety-six million, two hundred thirty-five thousand, five hundred".