81634529552 has 10 divisors (see below), whose sum is σ = 158166901038. Its totient is φ = 40817264768.

The previous prime is 81634529531. The next prime is 81634529563. The reversal of 81634529552 is 25592543618.

It can be written as a sum of positive squares in only one way, i.e., 74701635856 + 6932893696 = 273316^2 + 83264^2 .

It is a super-3 number, since 3×81634529552³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 81634529552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2551079033 + ... + 2551079064.

Almost surely, 2^81634529552 is an apocalyptic number.

It is an amenable number.

81634529552 is a deficient number, since it is larger than the sum of its proper divisors (76532371486).

81634529552 is a wasteful number, since it uses less digits than its factorization.

81634529552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102158105 (or 5102158099 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 50.

The spelling of 81634529552 in words is "eighty-one billion, six hundred thirty-four million, five hundred twenty-nine thousand, five hundred fifty-two".