166660541520 has 320 divisors, whose sum is σ = 580047803136. Its totient is φ = 39229194240.

The previous prime is 166660541513. The next prime is 166660541533. The reversal of 166660541520 is 25145066661.

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, 56359882 + ... + 56362838.

Almost surely, 2^166660541520 is an apocalyptic number.

166660541520 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 166660541520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290023901568).

166660541520 is an abundant number, since it is smaller than the sum of its proper divisors (413387261616).

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

166660541520 is a wasteful number, since it uses less digits than its factorization.

166660541520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598 (or 3592 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 166660541520 in words is "one hundred sixty-six billion, six hundred sixty million, five hundred forty-one thousand, five hundred twenty".