1668518501872 has 40 divisors (see below), whose sum is σ = 3292964236800. Its totient is φ = 818767879872.

The previous prime is 1668518501869. The next prime is 1668518501891. The reversal of 1668518501872 is 2781058158661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 882922 + ... + 2028937.

It is an arithmetic number, because the mean of its divisors is an integer number (82324105920).

Almost surely, 2^{1668518501872} is an apocalyptic number.

It is an amenable number.

1668518501872 is a deficient number, since it is larger than the sum of its proper divisors (1624445734928).

1668518501872 is a wasteful number, since it uses less digits than its factorization.

1668518501872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912533 (or 2912527 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 58.

The spelling of 1668518501872 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, five hundred one thousand, eight hundred seventy-two".