1668383853855 has 32 divisors (see below), whose sum is σ = 2671658900928. Its totient is φ = 889056768000.

The previous prime is 1668383853817. The next prime is 1668383853863. The reversal of 1668383853855 is 5583583838661.

It is not a de Polignac number, because 1668383853855 - 2¹³ = 1668383845663 is a prime.

It is a super-2 number, since 2×1668383853855² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1668383853855.

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, 170569065 + ... + 170578845.

It is an arithmetic number, because the mean of its divisors is an integer number (83489340654).

Almost surely, 2^{1668383853855} is an apocalyptic number.

1668383853855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668383853855 is a deficient number, since it is larger than the sum of its proper divisors (1003275047073).

1668383853855 is a wasteful number, since it uses less digits than its factorization.

1668383853855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18187.

The product of its digits is 497664000, while the sum is 69.

The spelling of 1668383853855 in words is "one trillion, six hundred sixty-eight billion, three hundred eighty-three million, eight hundred fifty-three thousand, eight hundred fifty-five".