81046572692569 has 27 divisors (see below), whose sum is σ = 90364468374453. Its totient is φ = 72634672433400.

The previous prime is 81046572692567. The next prime is 81046572692611. The reversal of 81046572692569 is 96529627564018.

The square root of 81046572692569 is 9002587.

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

It is not a de Polignac number, because 81046572692569 - 2¹ = 81046572692567 is a prime.

It is a super-2 number, since 2×81046572692569² (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 = 81046572692498 and 81046572692507.

It is not an unprimeable number, because it can be changed into a prime (81046572692567) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7031014684 + ... + 7031026210.

Almost surely, 2^{81046572692569} is an apocalyptic number.

81046572692569 is the 9002587-th square number.

81046572692569 is the 4501294-th centered octagonal number.

It is an amenable number.

81046572692569 is a deficient number, since it is larger than the sum of its proper divisors (9317895681884).

81046572692569 is an frugal number, since it uses more digits than its factorization.

81046572692569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23218 (or 11609 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 70.

The spelling of 81046572692569 in words is "eighty-one trillion, forty-six billion, five hundred seventy-two million, six hundred ninety-two thousand, five hundred sixty-nine".