81328853428353 has 6 divisors (see below), whose sum is σ = 117475010507634. Its totient is φ = 54219235618896.

The previous prime is 81328853428351. The next prime is 81328853428367. The reversal of 81328853428353 is 35382435882318.

It is a happy number.

81328853428353 is a `hidden beast` number, since 8 + 1 + 3 + 28 + 8 + 534 + 28 + 3 + 53 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59472368219889 + 21856485208464 = 7711833^2 + 4675092^2 .

It is not a de Polignac number, because 81328853428353 - 2¹ = 81328853428351 is a prime.

It is a super-2 number, since 2×81328853428353² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81328853428351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4518269634900 + ... + 4518269634917.

It is an arithmetic number, because the mean of its divisors is an integer number (19579168417939).

Almost surely, 2^{81328853428353} is an apocalyptic number.

It is an amenable number.

81328853428353 is a deficient number, since it is larger than the sum of its proper divisors (36146157079281).

81328853428353 is a wasteful number, since it uses less digits than its factorization.

81328853428353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036539269823 (or 9036539269820 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 63.

The spelling of 81328853428353 in words is "eighty-one trillion, three hundred twenty-eight billion, eight hundred fifty-three million, four hundred twenty-eight thousand, three hundred fifty-three".