166561660672 has 36 divisors (see below), whose sum is σ = 362697485976. Its totient is φ = 75709844480.

The previous prime is 166561660669. The next prime is 166561660691. The reversal of 166561660672 is 276066165661.

166561660672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 29571343 + ... + 29576974.

It is an arithmetic number, because the mean of its divisors is an integer number (10074930166).

Almost surely, 2^166561660672 is an apocalyptic number.

It is an amenable number.

166561660672 is an abundant number, since it is smaller than the sum of its proper divisors (196135825304).

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

166561660672 is an equidigital number, since it uses as much as digits as its factorization.

166561660672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59148344 (or 59148330 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 166561660672 in words is "one hundred sixty-six billion, five hundred sixty-one million, six hundred sixty thousand, six hundred seventy-two".