166884081870 has 128 divisors (see below), whose sum is σ = 461841937920. Its totient is φ = 38168064000.

The previous prime is 166884081841. The next prime is 166884081977. The reversal of 166884081870 is 78180488661.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 166884081870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1455850 + ... + 1566290.

It is an arithmetic number, because the mean of its divisors is an integer number (3608140140).

Almost surely, 2^166884081870 is an apocalyptic number.

166884081870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166884081870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230920968960).

166884081870 is an abundant number, since it is smaller than the sum of its proper divisors (294957856050).

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

166884081870 is a wasteful number, since it uses less digits than its factorization.

166884081870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110722.

The product of its (nonzero) digits is 4128768, while the sum is 57.

The spelling of 166884081870 in words is "one hundred sixty-six billion, eight hundred eighty-four million, eighty-one thousand, eight hundred seventy".