1688444242845 has 32 divisors (see below), whose sum is σ = 2774628832512. Its totient is φ = 876132744192.

The previous prime is 1688444242817. The next prime is 1688444242907. The reversal of 1688444242845 is 5482424448861.

It is not a de Polignac number, because 1688444242845 - 2⁶ = 1688444242781 is a prime.

It is a super-2 number, since 2×1688444242845² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23381064 + ... + 23453166.

It is an arithmetic number, because the mean of its divisors is an integer number (86707151016).

Almost surely, 2^{1688444242845} is an apocalyptic number.

1688444242845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1688444242845 is a deficient number, since it is larger than the sum of its proper divisors (1086184589667).

1688444242845 is a wasteful number, since it uses less digits than its factorization.

1688444242845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114341.

The product of its digits is 62914560, while the sum is 60.

The spelling of 1688444242845 in words is "one trillion, six hundred eighty-eight billion, four hundred forty-four million, two hundred forty-two thousand, eight hundred forty-five".