990699109506 has 12 divisors (see below), whose sum is σ = 2146514737302. Its totient is φ = 330233036496.

The previous prime is 990699109489. The next prime is 990699109513. The reversal of 990699109506 is 605901996099.

It can be written as a sum of positive squares in only one way, i.e., 630609103881 + 360090005625 = 794109^2 + 600075^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27519419691 + ... + 27519419726.

Almost surely, 2^990699109506 is an apocalyptic number.

990699109506 is an abundant number, since it is smaller than the sum of its proper divisors (1155815627796).

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

990699109506 is a wasteful number, since it uses less digits than its factorization.

990699109506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55038839425 (or 55038839422 counting only the distinct ones).

The product of its (nonzero) digits is 10628820, while the sum is 63.

The spelling of 990699109506 in words is "nine hundred ninety billion, six hundred ninety-nine million, one hundred nine thousand, five hundred six".