166438025670 has 128 divisors (see below), whose sum is σ = 473687285760. Its totient is φ = 36624752640.

The previous prime is 166438025647. The next prime is 166438025687. The reversal of 166438025670 is 76520834661.

166438025670 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 63 ways as a sum of consecutive naturals, for example, 1190196 + ... + 1322664.

It is an arithmetic number, because the mean of its divisors is an integer number (3700681920).

Almost surely, 2^166438025670 is an apocalyptic number.

166438025670 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 166438025670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236843642880).

166438025670 is an abundant number, since it is smaller than the sum of its proper divisors (307249260090).

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

166438025670 is a wasteful number, since it uses less digits than its factorization.

166438025670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132710.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 166438025670 in words is "one hundred sixty-six billion, four hundred thirty-eight million, twenty-five thousand, six hundred seventy".