1628870571666 has 48 divisors (see below), whose sum is σ = 3823456762944. Its totient is φ = 498189789792.

The previous prime is 1628870571661. The next prime is 1628870571707. The reversal of 1628870571666 is 6661750788261.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1628870571661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20802196 + ... + 20880351.

It is an arithmetic number, because the mean of its divisors is an integer number (79655349228).

Almost surely, 2^{1628870571666} is an apocalyptic number.

1628870571666 is an abundant number, since it is smaller than the sum of its proper divisors (2194586191278).

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

1628870571666 is a wasteful number, since it uses less digits than its factorization.

1628870571666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41682735 (or 41682732 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 1628870571666 in words is "one trillion, six hundred twenty-eight billion, eight hundred seventy million, five hundred seventy-one thousand, six hundred sixty-six".