81722997104 has 40 divisors (see below), whose sum is σ = 183924606048. Its totient is φ = 34449972480.

The previous prime is 81722997079. The next prime is 81722997113. The reversal of 81722997104 is 40179922718.

It is a congruent number.

It is an unprimeable number.

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, 5974067 + ... + 5987730.

Almost surely, 2^81722997104 is an apocalyptic number.

It is an amenable number.

81722997104 is an abundant number, since it is smaller than the sum of its proper divisors (102201608944).

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

81722997104 is a wasteful number, since it uses less digits than its factorization.

81722997104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961873 (or 11961867 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 81722997104 in words is "eighty-one billion, seven hundred twenty-two million, nine hundred ninety-seven thousand, one hundred four".