990625800811 has 2 divisors, whose sum is σ = 990625800812. Its totient is φ = 990625800810.

The previous prime is 990625800809. The next prime is 990625800851. The reversal of 990625800811 is 118008526099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990625800811 - 2¹ = 990625800809 is a prime.

Together with 990625800809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (990625800851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495312900405 + 495312900406.

It is an arithmetic number, because the mean of its divisors is an integer number (495312900406).

Almost surely, 2^990625800811 is an apocalyptic number.

990625800811 is a deficient number, since it is larger than the sum of its proper divisors (1).

990625800811 is an equidigital number, since it uses as much as digits as its factorization.

990625800811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 990625800811 in words is "nine hundred ninety billion, six hundred twenty-five million, eight hundred thousand, eight hundred eleven".