81552688064 has 28 divisors (see below), whose sum is σ = 161980132224. Its totient is φ = 40738796544.

The previous prime is 81552688043. The next prime is 81552688069. The reversal of 81552688064 is 46088625518.

It is a junction number, because it is equal to n+sod(n) for n = 81552687997 and 81552688015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81552688069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516569 + ... + 655704.

Almost surely, 2^81552688064 is an apocalyptic number.

It is an amenable number.

81552688064 is a deficient number, since it is larger than the sum of its proper divisors (80427444160).

81552688064 is a wasteful number, since it uses less digits than its factorization.

81552688064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173372 (or 1173362 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 53.

The spelling of 81552688064 in words is "eighty-one billion, five hundred fifty-two million, six hundred eighty-eight thousand, sixty-four".