990226942898 has 6 divisors (see below), whose sum is σ = 1485342525279. Its totient is φ = 495112767806.

The previous prime is 990226942891. The next prime is 990226942949. The reversal of 990226942898 is 898249622099.

It can be written as a sum of positive squares in only one way, i.e., 495113471449 + 495113471449 = 703643^2 + 703643^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=703643.

It is a super-3 number, since 3×990226942898³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990226942891) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 1055465 + ... + 1759107.

Almost surely, 2^990226942898 is an apocalyptic number.

990226942898 is a deficient number, since it is larger than the sum of its proper divisors (495115582381).

990226942898 is an frugal number, since it uses more digits than its factorization.

990226942898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407288 (or 703645 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 68.

The spelling of 990226942898 in words is "nine hundred ninety billion, two hundred twenty-six million, nine hundred forty-two thousand, eight hundred ninety-eight".