1688323145 has 4 divisors (see below), whose sum is σ = 2025987780. Its totient is φ = 1350658512.

The previous prime is 1688323139. The next prime is 1688323163. The reversal of 1688323145 is 5413238861.

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 340919296 + 1347403849 = 18464^2 + 36707^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688323145 - 2⁶ = 1688323081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168832310 + ... + 168832319.

It is an arithmetic number, because the mean of its divisors is an integer number (506496945).

Almost surely, 2^1688323145 is an apocalyptic number.

It is an amenable number.

1688323145 is a deficient number, since it is larger than the sum of its proper divisors (337664635).

1688323145 is an equidigital number, since it uses as much as digits as its factorization.

1688323145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337664634.

The product of its digits is 138240, while the sum is 41.

The square root of 1688323145 is about 41089.2095932740. The cubic root of 1688323145 is about 1190.7443369521.

The spelling of 1688323145 in words is "one billion, six hundred eighty-eight million, three hundred twenty-three thousand, one hundred forty-five".