81040338002 has 16 divisors (see below), whose sum is σ = 138611981592. Its totient is φ = 35203042560.

The previous prime is 81040337999. The next prime is 81040338007. The reversal of 81040338002 is 20083304018.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37171454401 + 43868883601 = 192799^2 + 209449^2 .

It is not an unprimeable number, because it can be changed into a prime (81040338007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91674149 + ... + 91675032.

Almost surely, 2^81040338002 is an apocalyptic number.

81040338002 is a deficient number, since it is larger than the sum of its proper divisors (57571643590).

81040338002 is a wasteful number, since it uses less digits than its factorization.

81040338002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183349213.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 81040338002 in words is "eighty-one billion, forty million, three hundred thirty-eight thousand, two".