1668366668535 has 16 divisors (see below), whose sum is σ = 3050727622656. Its totient is φ = 762681905568.

The previous prime is 1668366668519. The next prime is 1668366668537. The reversal of 1668366668535 is 5358666638661.

It is not a de Polignac number, because 1668366668535 - 2⁴ = 1668366668519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668366668535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668366668537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7944603079 + ... + 7944603288.

It is an arithmetic number, because the mean of its divisors is an integer number (190670476416).

Almost surely, 2^{1668366668535} is an apocalyptic number.

1668366668535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668366668535 is a deficient number, since it is larger than the sum of its proper divisors (1382360954121).

1668366668535 is a wasteful number, since it uses less digits than its factorization.

1668366668535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15889206382.

The product of its digits is 671846400, while the sum is 69.

The spelling of 1668366668535 in words is "one trillion, six hundred sixty-eight billion, three hundred sixty-six million, six hundred sixty-eight thousand, five hundred thirty-five".