81058276478169 has 81 divisors (see below), whose sum is σ = 122078699627157. Its totient is φ = 51826233466800.

The previous prime is 81058276478141. The next prime is 81058276478171. The reversal of 81058276478169 is 96187467285018.

It is a happy number.

The square root of 81058276478169 is 9003237.

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

81058276478169 is a `hidden beast` number, since 8 + 1 + 0 + 5 + 82 + 76 + 478 + 1 + 6 + 9 = 666.

It is not a de Polignac number, because 81058276478169 - 2¹⁹ = 81058275953881 is a prime.

It is a super-2 number, since 2×81058276478169² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81058276478097 and 81058276478106.

It is not an unprimeable number, because it can be changed into a prime (81058276478969) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 109686436002 + ... + 109686436740.

Almost surely, 2^{81058276478169} is an apocalyptic number.

81058276478169 is the 9003237-th square number.

81058276478169 is the 4501619-th centered octagonal number.

It is an amenable number.

81058276478169 is a deficient number, since it is larger than the sum of its proper divisors (41020423148988).

81058276478169 is an frugal number, since it uses more digits than its factorization.

81058276478169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 325140480, while the sum is 72.

The spelling of 81058276478169 in words is "eighty-one trillion, fifty-eight billion, two hundred seventy-six million, four hundred seventy-eight thousand, one hundred sixty-nine".