1688450065 has 4 divisors (see below), whose sum is σ = 2026140084. Its totient is φ = 1350760048.

The previous prime is 1688450059. The next prime is 1688450089. The reversal of 1688450065 is 5600548861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287370304 + 1401079761 = 16952^2 + 37431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688450065 - 2¹⁹ = 1687925777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168845002 + ... + 168845011.

It is an arithmetic number, because the mean of its divisors is an integer number (506535021).

Almost surely, 2^1688450065 is an apocalyptic number.

It is an amenable number.

1688450065 is a deficient number, since it is larger than the sum of its proper divisors (337690019).

1688450065 is an equidigital number, since it uses as much as digits as its factorization.

1688450065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337690018.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 1688450065 is about 41090.7540086575. The cubic root of 1688450065 is about 1190.7741743453.

The spelling of 1688450065 in words is "one billion, six hundred eighty-eight million, four hundred fifty thousand, sixty-five".