990056397587 has 2 divisors, whose sum is σ = 990056397588. Its totient is φ = 990056397586.

The previous prime is 990056397559. The next prime is 990056397593. The reversal of 990056397587 is 785793650099.

It is a strong prime.

It is an emirp because it is prime and its reverse (785793650099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990056397587 - 2⁸ = 990056397331 is a prime.

It is not a weakly prime, because it can be changed into another prime (990056397887) 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, 495028198793 + 495028198794.

It is an arithmetic number, because the mean of its divisors is an integer number (495028198794).

Almost surely, 2^990056397587 is an apocalyptic number.

990056397587 is a deficient number, since it is larger than the sum of its proper divisors (1).

990056397587 is an equidigital number, since it uses as much as digits as its factorization.

990056397587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128595600, while the sum is 68.

The spelling of 990056397587 in words is "nine hundred ninety billion, fifty-six million, three hundred ninety-seven thousand, five hundred eighty-seven".