80711555249521 has 81 divisors (see below), whose sum is σ = 100674789795489. Its totient is φ = 64512027148800.

The previous prime is 80711555249509. The next prime is 80711555249557. The reversal of 80711555249521 is 12594255511708.

The square root of 80711555249521 is 8983961.

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

It can be written as a sum of positive squares in 4 ways, for example, as 51447783089521 + 29263772160000 = 7172711^2 + 5409600^2 .

It is not a de Polignac number, because 80711555249521 - 2⁵ = 80711555249489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80711555240521) 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 80 ways as a sum of consecutive naturals, for example, 59303125881 + ... + 59303127241.

Almost surely, 2^{80711555249521} is an apocalyptic number.

80711555249521 is the 8983961-st square number.

80711555249521 is the 4491981-st centered octagonal number.

It is an amenable number.

80711555249521 is a deficient number, since it is larger than the sum of its proper divisors (19963234545968).

80711555249521 is an frugal number, since it uses more digits than its factorization.

80711555249521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 5040000, while the sum is 55.

The spelling of 80711555249521 in words is "eighty trillion, seven hundred eleven billion, five hundred fifty-five million, two hundred forty-nine thousand, five hundred twenty-one".