210645335489 has 2 divisors, whose sum is σ = 210645335490. Its totient is φ = 210645335488.

The previous prime is 210645335413. The next prime is 210645335501. The reversal of 210645335489 is 984533546012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201069734464 + 9575601025 = 448408^2 + 97855^2 .

It is a cyclic number.

It is not a de Polignac number, because 210645335489 - 2⁸ = 210645335233 is a prime.

It is not a weakly prime, because it can be changed into another prime (210645334489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105322667744 + 105322667745.

It is an arithmetic number, because the mean of its divisors is an integer number (105322667745).

Almost surely, 2^210645335489 is an apocalyptic number.

It is an amenable number.

210645335489 is a deficient number, since it is larger than the sum of its proper divisors (1).

210645335489 is an equidigital number, since it uses as much as digits as its factorization.

210645335489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 210645335489 in words is "two hundred ten billion, six hundred forty-five million, three hundred thirty-five thousand, four hundred eighty-nine".