81229200192 has 168 divisors, whose sum is σ = 275945656896. Its totient is φ = 23208311808.

The previous prime is 81229200179. The next prime is 81229200323. The reversal of 81229200192 is 29100292218.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264213 + ... + 481940.

It is an arithmetic number, because the mean of its divisors is an integer number (1642533672).

Almost surely, 2^81229200192 is an apocalyptic number.

It is an amenable number.

81229200192 is an abundant number, since it is smaller than the sum of its proper divisors (194716456704).

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

81229200192 is an equidigital number, since it uses as much as digits as its factorization.

81229200192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746187 (or 746165 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 81229200192 in words is "eighty-one billion, two hundred twenty-nine million, two hundred thousand, one hundred ninety-two".