166539452500 has 30 divisors (see below), whose sum is σ = 364188480194. Its totient is φ = 66615780000.

The previous prime is 166539452483. The next prime is 166539452507. The reversal of 166539452500 is 5254935661.

166539452500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 74237721156 + 92301731344 = 272466^2 + 303812^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166539452507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33305391 + ... + 33310390.

Almost surely, 2^166539452500 is an apocalyptic number.

166539452500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166539452500 is an abundant number, since it is smaller than the sum of its proper divisors (197649027694).

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

166539452500 is an equidigital number, since it uses as much as digits as its factorization.

166539452500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66615805 (or 66615788 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 166539452500 in words is "one hundred sixty-six billion, five hundred thirty-nine million, four hundred fifty-two thousand, five hundred".