81926662424320 has 144 divisors (see below), whose sum is σ = 236078146160640. Its totient is φ = 26610765484032.

The previous prime is 81926662424297. The next prime is 81926662424389. The reversal of 81926662424320 is 2342426662918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240450832 + ... + 240791311.

It is an arithmetic number, because the mean of its divisors is an integer number (1639431570560).

Almost surely, 2^{81926662424320} is an apocalyptic number.

81926662424320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81926662424320 is an abundant number, since it is smaller than the sum of its proper divisors (154151483736320).

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

81926662424320 is a wasteful number, since it uses less digits than its factorization.

81926662424320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481242190 (or 481242176 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 55.

The spelling of 81926662424320 in words is "eighty-one trillion, nine hundred twenty-six billion, six hundred sixty-two million, four hundred twenty-four thousand, three hundred twenty".