166541302538 has 16 divisors (see below), whose sum is σ = 272713579656. Its totient is φ = 75812267520.

The previous prime is 166541302489. The next prime is 166541302541. The reversal of 166541302538 is 835203145661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61783564969 + 104757737569 = 248563^2 + 323663^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43870943 + ... + 43874738.

Almost surely, 2^166541302538 is an apocalyptic number.

166541302538 is a deficient number, since it is larger than the sum of its proper divisors (106172277118).

166541302538 is a wasteful number, since it uses less digits than its factorization.

166541302538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87745769.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 166541302538 in words is "one hundred sixty-six billion, five hundred forty-one million, three hundred two thousand, five hundred thirty-eight".