166643028887 has 16 divisors (see below), whose sum is σ = 184183891200. Its totient is φ = 150075678720.

The previous prime is 166643028847. The next prime is 166643028931. The reversal of 166643028887 is 788820346661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166643028887 - 2⁸ = 166643028631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643028847) 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, 1729562 + ... + 1823367.

It is an arithmetic number, because the mean of its divisors is an integer number (11511493200).

Almost surely, 2^166643028887 is an apocalyptic number.

166643028887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166643028887 is a deficient number, since it is larger than the sum of its proper divisors (17540862313).

166643028887 is a wasteful number, since it uses less digits than its factorization.

166643028887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553066.

The product of its (nonzero) digits is 18579456, while the sum is 59.

The spelling of 166643028887 in words is "one hundred sixty-six billion, six hundred forty-three million, twenty-eight thousand, eight hundred eighty-seven".