81040414472 has 32 divisors (see below), whose sum is σ = 156938624280. Its totient is φ = 39211061760.

The previous prime is 81040414471. The next prime is 81040414513. The reversal of 81040414472 is 27441404018.

It can be written as a sum of positive squares in 4 ways, for example, as 75991743556 + 5048670916 = 275666^2 + 71054^2 .

It is not an unprimeable number, because it can be changed into a prime (81040414471) by changing a digit.

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, 1278179 + ... + 1340082.

Almost surely, 2^81040414472 is an apocalyptic number.

It is an amenable number.

81040414472 is a deficient number, since it is larger than the sum of its proper divisors (75898209808).

81040414472 is a wasteful number, since it uses less digits than its factorization.

81040414472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618393 (or 2618389 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The spelling of 81040414472 in words is "eighty-one billion, forty million, four hundred fourteen thousand, four hundred seventy-two".