81238926898 has 16 divisors (see below), whose sum is σ = 124030759680. Its totient is φ = 39899563200.

The previous prime is 81238926893. The next prime is 81238926947. The reversal of 81238926898 is 89862983218.

It is not an unprimeable number, because it can be changed into a prime (81238926893) by changing a digit.

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, 1017063 + ... + 1094026.

It is an arithmetic number, because the mean of its divisors is an integer number (7751922480).

Almost surely, 2^81238926898 is an apocalyptic number.

81238926898 is a deficient number, since it is larger than the sum of its proper divisors (42791832782).

81238926898 is a wasteful number, since it uses less digits than its factorization.

81238926898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111433.

The product of its digits is 23887872, while the sum is 64.

The spelling of 81238926898 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-six thousand, eight hundred ninety-eight".