166649543424 has 576 divisors, whose sum is σ = 618105600000. Its totient is φ = 43113627648.

The previous prime is 166649543407. The next prime is 166649543443. The reversal of 166649543424 is 424345946661.

166649543424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 33334077 + ... + 33339075.

It is an arithmetic number, because the mean of its divisors is an integer number (1073100000).

Almost surely, 2^166649543424 is an apocalyptic number.

166649543424 is a gapful number since it is divisible by the number (14) 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 166649543424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309052800000).

166649543424 is an abundant number, since it is smaller than the sum of its proper divisors (451456056576).

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

166649543424 is a wasteful number, since it uses less digits than its factorization.

166649543424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097 (or 5077 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 54.

The spelling of 166649543424 in words is "one hundred sixty-six billion, six hundred forty-nine million, five hundred forty-three thousand, four hundred twenty-four".