990509078899 has 2 divisors, whose sum is σ = 990509078900. Its totient is φ = 990509078898.

The previous prime is 990509078893. The next prime is 990509078941. The reversal of 990509078899 is 998870905099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990509078899 - 2¹⁹ = 990508554611 is a prime.

It is a super-2 number, since 2×990509078899² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990509078893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495254539449 + 495254539450.

It is an arithmetic number, because the mean of its divisors is an integer number (495254539450).

Almost surely, 2^990509078899 is an apocalyptic number.

990509078899 is a deficient number, since it is larger than the sum of its proper divisors (1).

990509078899 is an equidigital number, since it uses as much as digits as its factorization.

990509078899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132269760, while the sum is 73.

The spelling of 990509078899 in words is "nine hundred ninety billion, five hundred nine million, seventy-eight thousand, eight hundred ninety-nine".