81613003338 has 24 divisors (see below), whose sum is σ = 178578951876. Its totient is φ = 26934984000.

The previous prime is 81613003321. The next prime is 81613003349. The reversal of 81613003338 is 83330031618.

81613003338 is a `hidden beast` number, since 8 + 1 + 613 + 0 + 0 + 3 + 3 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51671199969 + 29941803369 = 227313^2 + 173037^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22444003 + ... + 22447638.

Almost surely, 2^81613003338 is an apocalyptic number.

81613003338 is an abundant number, since it is smaller than the sum of its proper divisors (96965948538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81613003338 is a wasteful number, since it uses less digits than its factorization.

81613003338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44891750 (or 44891747 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 81613003338 in words is "eighty-one billion, six hundred thirteen million, three thousand, three hundred thirty-eight".