81192943552 has 42 divisors (see below), whose sum is σ = 187422111312. Its totient is φ = 34796974464.

The previous prime is 81192943549. The next prime is 81192943571. The reversal of 81192943552 is 25534929118.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 81192943496 and 81192943505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12942168 + ... + 12948439.

Almost surely, 2^81192943552 is an apocalyptic number.

It is an amenable number.

81192943552 is an abundant number, since it is smaller than the sum of its proper divisors (106229167760).

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

81192943552 is a wasteful number, since it uses less digits than its factorization.

81192943552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25890633 (or 25890616 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

The spelling of 81192943552 in words is "eighty-one billion, one hundred ninety-two million, nine hundred forty-three thousand, five hundred fifty-two".