81194348592 has 320 divisors, whose sum is σ = 282187494400. Its totient is φ = 21835008000.

The previous prime is 81194348551. The next prime is 81194348603. The reversal of 81194348592 is 29584349118.

It is a happy number.

81194348592 is a `hidden beast` number, since 8 + 1 + 1 + 9 + 4 + 3 + 48 + 592 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9016092 + ... + 9025092.

It is an arithmetic number, because the mean of its divisors is an integer number (881835920).

Almost surely, 2^81194348592 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 81194348592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141093747200).

81194348592 is an abundant number, since it is smaller than the sum of its proper divisors (200993145808).

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

81194348592 is a wasteful number, since it uses less digits than its factorization.

81194348592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201 (or 9189 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 81194348592 in words is "eighty-one billion, one hundred ninety-four million, three hundred forty-eight thousand, five hundred ninety-two".