166805538753 has 16 divisors (see below), whose sum is σ = 256181288960. Its totient is φ = 94566918096.

The previous prime is 166805538707. The next prime is 166805538763. The reversal of 166805538753 is 357835508661.

It is not a de Polignac number, because 166805538753 - 2⁶ = 166805538689 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166805538693 and 166805538702.

It is not an unprimeable number, because it can be changed into a prime (166805538763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31269463 + ... + 31274796.

It is an arithmetic number, because the mean of its divisors is an integer number (16011330560).

Almost surely, 2^166805538753 is an apocalyptic number.

It is an amenable number.

166805538753 is a deficient number, since it is larger than the sum of its proper divisors (89375750207).

166805538753 is a wasteful number, since it uses less digits than its factorization.

166805538753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62544396.

The product of its (nonzero) digits is 18144000, while the sum is 57.

The spelling of 166805538753 in words is "one hundred sixty-six billion, eight hundred five million, five hundred thirty-eight thousand, seven hundred fifty-three".