166157843880 has 256 divisors, whose sum is σ = 580437849600. Its totient is φ = 37265080320.

The previous prime is 166157843851. The next prime is 166157843921. The reversal of 166157843880 is 88348751661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 166157843880.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22183176 + ... + 22190664.

It is an arithmetic number, because the mean of its divisors is an integer number (2267335350).

Almost surely, 2^166157843880 is an apocalyptic number.

166157843880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166157843880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290218924800).

166157843880 is an abundant number, since it is smaller than the sum of its proper divisors (414280005720).

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

166157843880 is a wasteful number, since it uses less digits than its factorization.

166157843880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004 (or 8000 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 166157843880 in words is "one hundred sixty-six billion, one hundred fifty-seven million, eight hundred forty-three thousand, eight hundred eighty".