81075633327 has 24 divisors (see below), whose sum is σ = 126141226848. Its totient is φ = 49883371200.

The previous prime is 81075633319. The next prime is 81075633337. The reversal of 81075633327 is 72333657018.

81075633327 is a `hidden beast` number, since 8 + 1 + 0 + 7 + 5 + 633 + 3 + 2 + 7 = 666.

It is not a de Polignac number, because 81075633327 - 2³ = 81075633319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81075633337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 592177 + ... + 716117.

It is an arithmetic number, because the mean of its divisors is an integer number (5255884452).

Almost surely, 2^81075633327 is an apocalyptic number.

81075633327 is a deficient number, since it is larger than the sum of its proper divisors (45065593521).

81075633327 is a wasteful number, since it uses less digits than its factorization.

81075633327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129551 (or 129548 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 81075633327 in words is "eighty-one billion, seventy-five million, six hundred thirty-three thousand, three hundred twenty-seven".