1668551855 has 8 divisors (see below), whose sum is σ = 2009707200. Its totient is φ = 1329878176.

The previous prime is 1668551851. The next prime is 1668551891. The reversal of 1668551855 is 5581558661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668551855 - 2² = 1668551851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668551851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618935 + ... + 621624.

It is an arithmetic number, because the mean of its divisors is an integer number (251213400).

Almost surely, 2^1668551855 is an apocalyptic number.

1668551855 is a deficient number, since it is larger than the sum of its proper divisors (341155345).

1668551855 is a wasteful number, since it uses less digits than its factorization.

1668551855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240833.

The product of its digits is 1440000, while the sum is 50.

The square root of 1668551855 is about 40847.9112685092. The cubic root of 1668551855 is about 1186.0779606403.

The spelling of 1668551855 in words is "one billion, six hundred sixty-eight million, five hundred fifty-one thousand, eight hundred fifty-five".