166644130540 has 144 divisors (see below), whose sum is σ = 379456354368. Its totient is φ = 61419105792.

The previous prime is 166644130507. The next prime is 166644130633. The reversal of 166644130540 is 45031446661.

It is a happy number.

166644130540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 166644130493 and 166644130502.

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 47 ways as a sum of consecutive naturals, for example, 40318314 + ... + 40322446.

It is an arithmetic number, because the mean of its divisors is an integer number (2635113572).

Almost surely, 2^166644130540 is an apocalyptic number.

166644130540 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 166644130540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189728177184).

166644130540 is an abundant number, since it is smaller than the sum of its proper divisors (212812223828).

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

166644130540 is a wasteful number, since it uses less digits than its factorization.

166644130540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328 (or 4303 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 166644130540 in words is "one hundred sixty-six billion, six hundred forty-four million, one hundred thirty thousand, five hundred forty".