1688449012333 has 2 divisors, whose sum is σ = 1688449012334. Its totient is φ = 1688449012332.

The previous prime is 1688449012331. The next prime is 1688449012379. The reversal of 1688449012333 is 3332109448861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1512080930889 + 176368081444 = 1229667^2 + 419962^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688449012333 - 2¹ = 1688449012331 is a prime.

It is a super-2 number, since 2×1688449012333² (a number of 25 digits) contains 22 as substring.

Together with 1688449012331, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688449012331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844224506166 + 844224506167.

It is an arithmetic number, because the mean of its divisors is an integer number (844224506167).

Almost surely, 2^{1688449012333} is an apocalyptic number.

It is an amenable number.

1688449012333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688449012333 is an equidigital number, since it uses as much as digits as its factorization.

1688449012333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 1688449012333 in words is "one trillion, six hundred eighty-eight billion, four hundred forty-nine million, twelve thousand, three hundred thirty-three".