1668337016687 has 4 divisors (see below), whose sum is σ = 1820004018216. Its totient is φ = 1516670015160.

The previous prime is 1668337016659. The next prime is 1668337016693. The reversal of 1668337016687 is 7866107338661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1668337016687 - 2¹⁰ = 1668337015663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668337016617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75833500748 + ... + 75833500769.

It is an arithmetic number, because the mean of its divisors is an integer number (455001004554).

Almost surely, 2^{1668337016687} is an apocalyptic number.

1668337016687 is a deficient number, since it is larger than the sum of its proper divisors (151667001529).

1668337016687 is a wasteful number, since it uses less digits than its factorization.

1668337016687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151667001528.

The product of its (nonzero) digits is 36578304, while the sum is 62.

The spelling of 1668337016687 in words is "one trillion, six hundred sixty-eight billion, three hundred thirty-seven million, sixteen thousand, six hundred eighty-seven".