1668516668517 has 16 divisors (see below), whose sum is σ = 2330663182848. Its totient is φ = 1059742662000.

The previous prime is 1668516668501. The next prime is 1668516668519. The reversal of 1668516668517 is 7158666158661.

It is not a de Polignac number, because 1668516668517 - 2⁴ = 1668516668501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668516668519) 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, 48152803 + ... + 48187440.

It is an arithmetic number, because the mean of its divisors is an integer number (145666448928).

Almost surely, 2^{1668516668517} is an apocalyptic number.

It is an amenable number.

1668516668517 is a deficient number, since it is larger than the sum of its proper divisors (662146514331).

1668516668517 is a wasteful number, since it uses less digits than its factorization.

1668516668517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96340520.

The product of its digits is 87091200, while the sum is 66.

The spelling of 1668516668517 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, six hundred sixty-eight thousand, five hundred seventeen".