1887221671666 has 32 divisors (see below), whose sum is σ = 2885952521088. Its totient is φ = 925413033600.

The previous prime is 1887221671649. The next prime is 1887221671667. The reversal of 1887221671666 is 6661761227881.

It is not an unprimeable number, because it can be changed into a prime (1887221671667) 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, 36394990 + ... + 36446806.

It is an arithmetic number, because the mean of its divisors is an integer number (90186016284).

Almost surely, 2^{1887221671666} is an apocalyptic number.

1887221671666 is a deficient number, since it is larger than the sum of its proper divisors (998730849422).

1887221671666 is a wasteful number, since it uses less digits than its factorization.

1887221671666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53506.

The product of its digits is 16257024, while the sum is 61.

The spelling of 1887221671666 in words is "one trillion, eight hundred eighty-seven billion, two hundred twenty-one million, six hundred seventy-one thousand, six hundred sixty-six".