81224733292 has 12 divisors (see below), whose sum is σ = 143228347416. Its totient is φ = 40302348320.

The previous prime is 81224733287. The next prime is 81224733319. The reversal of 81224733292 is 29233742218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77503993 + ... + 77505040.

It is an arithmetic number, because the mean of its divisors is an integer number (11935695618).

Almost surely, 2^81224733292 is an apocalyptic number.

It is an amenable number.

81224733292 is a deficient number, since it is larger than the sum of its proper divisors (62003614124).

81224733292 is a wasteful number, since it uses less digits than its factorization.

81224733292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155009168 (or 155009166 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

The spelling of 81224733292 in words is "eighty-one billion, two hundred twenty-four million, seven hundred thirty-three thousand, two hundred ninety-two".