81268127940973 has 8 divisors (see below), whose sum is σ = 81360676587960. Its totient is φ = 81175627514880.

The previous prime is 81268127940959. The next prime is 81268127941061. The reversal of 81268127940973 is 37904972186218.

It can be written as a sum of positive squares in 4 ways, for example, as 1454812164 + 81266673128809 = 38142^2 + 9014803^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81268127940973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81268127940899 and 81268127940908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81268127940173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8682108 + ... + 15424501.

It is an arithmetic number, because the mean of its divisors is an integer number (10170084573495).

Almost surely, 2^{81268127940973} is an apocalyptic number.

It is an amenable number.

81268127940973 is a deficient number, since it is larger than the sum of its proper divisors (92548646987).

81268127940973 is a wasteful number, since it uses less digits than its factorization.

81268127940973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24110447.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 81268127940973 in words is "eighty-one trillion, two hundred sixty-eight billion, one hundred twenty-seven million, nine hundred forty thousand, nine hundred seventy-three".