90243663122 has 6 divisors (see below), whose sum is σ = 135366131943. Its totient is φ = 45121619142.

The previous prime is 90243663113. The next prime is 90243663173. The reversal of 90243663122 is 22136634209.

It can be written as a sum of positive squares in only one way, i.e., 45121831561 + 45121831561 = 212419^2 + 212419^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=212419.

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 318629 + ... + 531047.

Almost surely, 2^90243663122 is an apocalyptic number.

90243663122 is a deficient number, since it is larger than the sum of its proper divisors (45122468821).

90243663122 is an frugal number, since it uses more digits than its factorization.

90243663122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424840 (or 212421 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 90243663122 in words is "ninety billion, two hundred forty-three million, six hundred sixty-three thousand, one hundred twenty-two".