80281438720081 has 3 divisors (see below), whose sum is σ = 80281447680073. Its totient is φ = 80281429760090.

The previous prime is 80281438720003. The next prime is 80281438720211. The reversal of 80281438720081 is 18002783418208.

The square root of 80281438720081 is 8959991.

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 is not a de Polignac number, because 80281438720081 - 2⁷ = 80281438719953 is a prime.

It is a super-2 number, since 2×80281438720081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80281438720781) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 4479996 + ... + 13439986.

Almost surely, 2^{80281438720081} is an apocalyptic number.

80281438720081 is the 8959991-st square number.

80281438720081 is the 4479996-th centered octagonal number.

It is an amenable number.

80281438720081 is a deficient number, since it is larger than the sum of its proper divisors (8959992).

80281438720081 is an frugal number, since it uses more digits than its factorization.

80281438720081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17919982 (or 8959991 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 52.

The spelling of 80281438720081 in words is "eighty trillion, two hundred eighty-one billion, four hundred thirty-eight million, seven hundred twenty thousand, eighty-one".