80965965575881 has 3 divisors (see below), whose sum is σ = 80965974573991. Its totient is φ = 80965956577772.

The previous prime is 80965965575837. The next prime is 80965965575951. The reversal of 80965965575881 is 18857556956908.

The square root of 80965965575881 is 8998109.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 17738341079481 + 63227624496400 = 4211691^2 + 7951580^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80965965575881 is a prime.

It is a super-2 number, since 2×80965965575881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80965965575795 and 80965965575804.

It is not an unprimeable number, because it can be changed into a prime (80965965575981) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4499055 + ... + 13497163.

Almost surely, 2^{80965965575881} is an apocalyptic number.

80965965575881 is the 8998109-th square number.

80965965575881 is the 4499055-th centered octagonal number.

It is an amenable number.

80965965575881 is a deficient number, since it is larger than the sum of its proper divisors (8998110).

80965965575881 is an frugal number, since it uses more digits than its factorization.

80965965575881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17996218 (or 8998109 counting only the distinct ones).

The product of its (nonzero) digits is 6531840000, while the sum is 82.

The spelling of 80965965575881 in words is "eighty trillion, nine hundred sixty-five billion, nine hundred sixty-five million, five hundred seventy-five thousand, eight hundred eighty-one".