81216074132 has 12 divisors (see below), whose sum is σ = 142132499796. Its totient is φ = 40606788480.

The previous prime is 81216074101. The next prime is 81216074171. The reversal of 81216074132 is 23147061218.

It can be written as a sum of positive squares in 2 ways, for example, as 80635553296 + 580520836 = 283964^2 + 24094^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81216074092 and 81216074101.

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 3 ways as a sum of consecutive naturals, for example, 157253 + ... + 432620.

It is an arithmetic number, because the mean of its divisors is an integer number (11844374983).

Almost surely, 2^81216074132 is an apocalyptic number.

It is an amenable number.

81216074132 is a deficient number, since it is larger than the sum of its proper divisors (60916425664).

81216074132 is a wasteful number, since it uses less digits than its factorization.

81216074132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624298 (or 624296 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 81216074132 in words is "eighty-one billion, two hundred sixteen million, seventy-four thousand, one hundred thirty-two".