1668555505000 has 40 divisors (see below), whose sum is σ = 3909425559930. Its totient is φ = 667422200000.

The previous prime is 1668555504907. The next prime is 1668555505009. The reversal of 1668555505000 is 5055558661.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 38332157796 + 1630223347204 = 195786^2 + 1276802^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1668555505009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 166850551 + ... + 166860550.

Almost surely, 2^{1668555505000} is an apocalyptic number.

1668555505000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668555505000 is an abundant number, since it is smaller than the sum of its proper divisors (2240870054930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668555505000 is an equidigital number, since it uses as much as digits as its factorization.

1668555505000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333711127 (or 333711108 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 46.

The spelling of 1668555505000 in words is "one trillion, six hundred sixty-eight billion, five hundred fifty-five million, five hundred five thousand".