1665641575116 has 60 divisors (see below), whose sum is σ = 4472000343888. Its totient is φ = 540208074528.

The previous prime is 1665641575093. The next prime is 1665641575123. The reversal of 1665641575116 is 6115751465661.

1665641575116 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 64 + 1 + 575 + 1 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 69459216 + ... + 69483191.

Almost surely, 2^{1665641575116} is an apocalyptic number.

It is an amenable number.

1665641575116 is an abundant number, since it is smaller than the sum of its proper divisors (2806358768772).

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

1665641575116 is a wasteful number, since it uses less digits than its factorization.

1665641575116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138942460 (or 138942449 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 54.

The spelling of 1665641575116 in words is "one trillion, six hundred sixty-five billion, six hundred forty-one million, five hundred seventy-five thousand, one hundred sixteen".