1666109852646 has 16 divisors (see below), whose sum is σ = 3339741651264. Its totient is φ = 554116293224.

The previous prime is 1666109852597. The next prime is 1666109852651. The reversal of 1666109852646 is 6462589016661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666109852646.

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, 313411536 + ... + 313416851.

It is an arithmetic number, because the mean of its divisors is an integer number (208733853204).

Almost surely, 2^{1666109852646} is an apocalyptic number.

1666109852646 is an abundant number, since it is smaller than the sum of its proper divisors (1673631798618).

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

1666109852646 is a wasteful number, since it uses less digits than its factorization.

1666109852646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626828835.

The product of its (nonzero) digits is 22394880, while the sum is 60.

The spelling of 1666109852646 in words is "one trillion, six hundred sixty-six billion, one hundred nine million, eight hundred fifty-two thousand, six hundred forty-six".