81166476624 has 40 divisors (see below), whose sum is σ = 209690939040. Its totient is φ = 27054089088.

The previous prime is 81166476607. The next prime is 81166476661. The reversal of 81166476624 is 42667466118.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1344562 + ... + 1403630.

It is an arithmetic number, because the mean of its divisors is an integer number (5242273476).

Almost surely, 2^81166476624 is an apocalyptic number.

It is an amenable number.

81166476624 is an abundant number, since it is smaller than the sum of its proper divisors (128524462416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81166476624 is a wasteful number, since it uses less digits than its factorization.

81166476624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87707 (or 87701 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The spelling of 81166476624 in words is "eighty-one billion, one hundred sixty-six million, four hundred seventy-six thousand, six hundred twenty-four".