166513775375 has 16 divisors (see below), whose sum is σ = 207872097888. Its totient is φ = 133170696000.

The previous prime is 166513775369. The next prime is 166513775377. The reversal of 166513775375 is 573577315661.

It is not a de Polignac number, because 166513775375 - 2¹² = 166513771279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166513775375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166513775377) 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, 216419 + ... + 616331.

It is an arithmetic number, because the mean of its divisors is an integer number (12992006118).

Almost surely, 2^166513775375 is an apocalyptic number.

166513775375 is a deficient number, since it is larger than the sum of its proper divisors (41358322513).

166513775375 is an equidigital number, since it uses as much as digits as its factorization.

166513775375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403259 (or 403249 counting only the distinct ones).

The product of its digits is 13891500, while the sum is 56.

The spelling of 166513775375 in words is "one hundred sixty-six billion, five hundred thirteen million, seven hundred seventy-five thousand, three hundred seventy-five".