1688375227209 has 32 divisors (see below), whose sum is σ = 2542591175040. Its totient is φ = 987160473600.

The previous prime is 1688375227117. The next prime is 1688375227249. The reversal of 1688375227209 is 9027225738861.

It is not a de Polignac number, because 1688375227209 - 2⁸ = 1688375226953 is a prime.

It is a super-2 number, since 2×1688375227209² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1688375227249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439839 + ... + 1889499.

It is an arithmetic number, because the mean of its divisors is an integer number (79455974220).

Almost surely, 2^{1688375227209} is an apocalyptic number.

It is an amenable number.

1688375227209 is a deficient number, since it is larger than the sum of its proper divisors (854215947831).

1688375227209 is a wasteful number, since it uses less digits than its factorization.

1688375227209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450921.

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 1688375227209 in words is "one trillion, six hundred eighty-eight billion, three hundred seventy-five million, two hundred twenty-seven thousand, two hundred nine".