81754492192 has 48 divisors (see below), whose sum is σ = 170795482200. Its totient is φ = 38388400128.

The previous prime is 81754492189. The next prime is 81754492229. The reversal of 81754492192 is 29129445718.

It can be written as a sum of positive squares in 4 ways, for example, as 81747959056 + 6533136 = 285916^2 + 2556^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84184 + ... + 413032.

Almost surely, 2^81754492192 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 81754492192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85397741100).

81754492192 is an abundant number, since it is smaller than the sum of its proper divisors (89040990008).

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

81754492192 is a wasteful number, since it uses less digits than its factorization.

81754492192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329333 (or 329325 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The spelling of 81754492192 in words is "eighty-one billion, seven hundred fifty-four million, four hundred ninety-two thousand, one hundred ninety-two".