425998211609 has 2 divisors, whose sum is σ = 425998211610. Its totient is φ = 425998211608.

The previous prime is 425998211591. The next prime is 425998211651. The reversal of 425998211609 is 906112899524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 300965251609 + 125032960000 = 548603^2 + 353600^2 .

It is a cyclic number.

It is not a de Polignac number, because 425998211609 - 2¹⁶ = 425998146073 is a prime.

It is not a weakly prime, because it can be changed into another prime (425998211689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212999105804 + 212999105805.

It is an arithmetic number, because the mean of its divisors is an integer number (212999105805).

Almost surely, 2^425998211609 is an apocalyptic number.

It is an amenable number.

425998211609 is a deficient number, since it is larger than the sum of its proper divisors (1).

425998211609 is an equidigital number, since it uses as much as digits as its factorization.

425998211609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 425998211609 in words is "four hundred twenty-five billion, nine hundred ninety-eight million, two hundred eleven thousand, six hundred nine".