166807838421888 has 32 divisors (see below), whose sum is σ = 443083320809160. Its totient is φ = 55602612807168.

The previous prime is 166807838421787. The next prime is 166807838421893. The reversal of 166807838421888 is 888124838708661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217197705895 + ... + 217197706662.

Almost surely, 2^{166807838421888} is an apocalyptic number.

It is an amenable number.

166807838421888 is an abundant number, since it is smaller than the sum of its proper divisors (276275482387272).

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

166807838421888 is an equidigital number, since it uses as much as digits as its factorization.

166807838421888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434395412574 (or 434395412562 counting only the distinct ones).

The product of its (nonzero) digits is 1585446912, while the sum is 78.

The spelling of 166807838421888 in words is "one hundred sixty-six trillion, eight hundred seven billion, eight hundred thirty-eight million, four hundred twenty-one thousand, eight hundred eighty-eight".