81060805973 has 8 divisors (see below), whose sum is σ = 92645590848. Its totient is φ = 69477188544.

The previous prime is 81060805919. The next prime is 81060805993. The reversal of 81060805973 is 37950806018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81060805973 - 2¹⁰ = 81060804949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81060805993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137636 + ... + 425517.

It is an arithmetic number, because the mean of its divisors is an integer number (11580698856).

Almost surely, 2^81060805973 is an apocalyptic number.

It is an amenable number.

81060805973 is a deficient number, since it is larger than the sum of its proper divisors (11584784875).

81060805973 is a wasteful number, since it uses less digits than its factorization.

81060805973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583723.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 81060805973 in words is "eighty-one billion, sixty million, eight hundred five thousand, nine hundred seventy-three".