81552509476 has 9 divisors (see below), whose sum is σ = 142717891099. Its totient is φ = 40775969164.

The previous prime is 81552509453. The next prime is 81552509483. The reversal of 81552509476 is 67490525518.

It is a happy number.

The square root of 81552509476 is 285574.

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

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499755 + ... + 642541.

Almost surely, 2^81552509476 is an apocalyptic number.

81552509476 is the 285574-th square number.

It is an amenable number.

81552509476 is a deficient number, since it is larger than the sum of its proper divisors (61165381623).

81552509476 is an frugal number, since it uses more digits than its factorization.

81552509476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285578 (or 142789 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 52.

The spelling of 81552509476 in words is "eighty-one billion, five hundred fifty-two million, five hundred nine thousand, four hundred seventy-six".