990204801559 has 2 divisors, whose sum is σ = 990204801560. Its totient is φ = 990204801558.

The previous prime is 990204801557. The next prime is 990204801613. The reversal of 990204801559 is 955108402099.

990204801559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990204801559 - 2¹ = 990204801557 is a prime.

Together with 990204801557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990204801557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495102400779 + 495102400780.

It is an arithmetic number, because the mean of its divisors is an integer number (495102400780).

Almost surely, 2^990204801559 is an apocalyptic number.

990204801559 is a deficient number, since it is larger than the sum of its proper divisors (1).

990204801559 is an equidigital number, since it uses as much as digits as its factorization.

990204801559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 990204801559 in words is "nine hundred ninety billion, two hundred four million, eight hundred one thousand, five hundred fifty-nine".