990643359129 has 16 divisors (see below), whose sum is σ = 1321634793600. Its totient is φ = 660040537856.

The previous prime is 990643359119. The next prime is 990643359161. The reversal of 990643359129 is 921953346099.

It is a cyclic number.

It is not a de Polignac number, because 990643359129 - 2¹² = 990643355033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990643359119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43612027 + ... + 43634735.

It is an arithmetic number, because the mean of its divisors is an integer number (82602174600).

Almost surely, 2^990643359129 is an apocalyptic number.

It is an amenable number.

990643359129 is a deficient number, since it is larger than the sum of its proper divisors (330991434471).

990643359129 is a wasteful number, since it uses less digits than its factorization.

990643359129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30624.

The product of its (nonzero) digits is 14171760, while the sum is 60.

The spelling of 990643359129 in words is "nine hundred ninety billion, six hundred forty-three million, three hundred fifty-nine thousand, one hundred twenty-nine".