81924372070 has 16 divisors (see below), whose sum is σ = 156138215328. Its totient is φ = 30842116480.

The previous prime is 81924372067. The next prime is 81924372077. The reversal of 81924372070 is 7027342918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81924372077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240953866 + ... + 240954205.

It is an arithmetic number, because the mean of its divisors is an integer number (9758638458).

Almost surely, 2^81924372070 is an apocalyptic number.

81924372070 is a deficient number, since it is larger than the sum of its proper divisors (74213843258).

81924372070 is a wasteful number, since it uses less digits than its factorization.

81924372070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481908095.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 81924372070 in words is "eighty-one billion, nine hundred twenty-four million, three hundred seventy-two thousand, seventy".