166038733601 has 4 divisors (see below), whose sum is σ = 178810943892. Its totient is φ = 153266523312.

The previous prime is 166038733577. The next prime is 166038733631. The reversal of 166038733601 is 106337830661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106337830661 = 111031 ⋅957731.

It can be written as a sum of positive squares in 2 ways, for example, as 10705006225 + 155333727376 = 103465^2 + 394124^2 .

It is a cyclic number.

It is not a de Polignac number, because 166038733601 - 2¹⁴ = 166038717217 is a prime.

It is a super-2 number, since 2×166038733601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166038733631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6386105126 + ... + 6386105151.

It is an arithmetic number, because the mean of its divisors is an integer number (44702735973).

Almost surely, 2^166038733601 is an apocalyptic number.

It is an amenable number.

166038733601 is a deficient number, since it is larger than the sum of its proper divisors (12772210291).

166038733601 is a wasteful number, since it uses less digits than its factorization.

166038733601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12772210290.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 166038733601 in words is "one hundred sixty-six billion, thirty-eight million, seven hundred thirty-three thousand, six hundred one".