81634529529 has 24 divisors (see below), whose sum is σ = 134769702912. Its totient is φ = 46645554240.

The previous prime is 81634529521. The next prime is 81634529531. The reversal of 81634529529 is 92592543618.

81634529529 is a `hidden beast` number, since 8 + 1 + 6 + 345 + 295 + 2 + 9 = 666.

It is not a de Polignac number, because 81634529529 - 2³ = 81634529521 is a prime.

It is a super-2 number, since 2×81634529529² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81634529521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1579237 + ... + 1630109.

It is an arithmetic number, because the mean of its divisors is an integer number (5615404288).

Almost surely, 2^81634529529 is an apocalyptic number.

It is an amenable number.

81634529529 is a deficient number, since it is larger than the sum of its proper divisors (53135173383).

81634529529 is a wasteful number, since it uses less digits than its factorization.

81634529529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76357 (or 76354 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 81634529529 in words is "eighty-one billion, six hundred thirty-four million, five hundred twenty-nine thousand, five hundred twenty-nine".