81776255232 has 108 divisors (see below), whose sum is σ = 253177942416. Its totient is φ = 23364633600.

The previous prime is 81776255177. The next prime is 81776255233. The reversal of 81776255232 is 23255267718.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (81776255233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1048894 + ... + 1124157.

Almost surely, 2^81776255232 is an apocalyptic number.

It is an amenable number.

81776255232 is an abundant number, since it is smaller than the sum of its proper divisors (171401687184).

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

81776255232 is a wasteful number, since it uses less digits than its factorization.

81776255232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173084 (or 2173063 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The spelling of 81776255232 in words is "eighty-one billion, seven hundred seventy-six million, two hundred fifty-five thousand, two hundred thirty-two".