81027532118 has 16 divisors (see below), whose sum is σ = 133109116560. Its totient is φ = 36763468896.

The previous prime is 81027532081. The next prime is 81027532153. The reversal of 81027532118 is 81123572018.

It is a super-2 number, since 2×81027532118² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 26409005 + ... + 26412072.

It is an arithmetic number, because the mean of its divisors is an integer number (8319319785).

Almost surely, 2^81027532118 is an apocalyptic number.

81027532118 is a deficient number, since it is larger than the sum of its proper divisors (52081584442).

81027532118 is a wasteful number, since it uses less digits than its factorization.

81027532118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52821151.

The product of its (nonzero) digits is 26880, while the sum is 38.

The spelling of 81027532118 in words is "eighty-one billion, twenty-seven million, five hundred thirty-two thousand, one hundred eighteen".