990598949999 has 4 divisors (see below), whose sum is σ = 990613149120. Its totient is φ = 990584750880.

The previous prime is 990598949987. The next prime is 990598950001. The reversal of 990598949999 is 999949895099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999949895099 = 31 ⋅32256448229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990598949999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990598940999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6994394 + ... + 7134615.

It is an arithmetic number, because the mean of its divisors is an integer number (247653287280).

Almost surely, 2^990598949999 is an apocalyptic number.

990598949999 is a deficient number, since it is larger than the sum of its proper divisors (14199121).

990598949999 is a wasteful number, since it uses less digits than its factorization.

990598949999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14199120.

The product of its (nonzero) digits is 6887475360, while the sum is 89.

The spelling of 990598949999 in words is "nine hundred ninety billion, five hundred ninety-eight million, nine hundred forty-nine thousand, nine hundred ninety-nine".