166500038889 has 16 divisors (see below), whose sum is σ = 246967203840. Its totient is φ = 110864810160.

The previous prime is 166500038857. The next prime is 166500038897. The reversal of 166500038889 is 988830005661.

166500038889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166500038889 - 2⁵ = 166500038857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166500030889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3733417 + ... + 3777750.

It is an arithmetic number, because the mean of its divisors is an integer number (15435450240).

Almost surely, 2^166500038889 is an apocalyptic number.

It is an amenable number.

166500038889 is a deficient number, since it is larger than the sum of its proper divisors (80467164951).

166500038889 is an equidigital number, since it uses as much as digits as its factorization.

166500038889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7511997 (or 7511991 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 166500038889 in words is "one hundred sixty-six billion, five hundred million, thirty-eight thousand, eight hundred eighty-nine".