81818448626 has 8 divisors (see below), whose sum is σ = 122968789740. Its totient is φ = 40828852048.

The previous prime is 81818448587. The next prime is 81818448637. The reversal of 81818448626 is 62684481818.

It can be written as a sum of positive squares in 2 ways, for example, as 80579338225 + 1239110401 = 283865^2 + 35201^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 40184861 + ... + 40186896.

Almost surely, 2^81818448626 is an apocalyptic number.

81818448626 is a deficient number, since it is larger than the sum of its proper divisors (41150341114).

81818448626 is a wasteful number, since it uses less digits than its factorization.

81818448626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80372268.

The product of its digits is 4718592, while the sum is 56.

The spelling of 81818448626 in words is "eighty-one billion, eight hundred eighteen million, four hundred forty-eight thousand, six hundred twenty-six".