81973097076 has 48 divisors (see below), whose sum is σ = 206030994624. Its totient is φ = 25216697856.

The previous prime is 81973097069. The next prime is 81973097081. The reversal of 81973097076 is 67079037918.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 647500 + ... + 763676.

It is an arithmetic number, because the mean of its divisors is an integer number (4292312388).

Almost surely, 2^81973097076 is an apocalyptic number.

It is an amenable number.

81973097076 is an abundant number, since it is smaller than the sum of its proper divisors (124057897548).

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

81973097076 is a wasteful number, since it uses less digits than its factorization.

81973097076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120720 (or 120718 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 57.

The spelling of 81973097076 in words is "eighty-one billion, nine hundred seventy-three million, ninety-seven thousand, seventy-six".