166500155605975 has 48 divisors (see below), whose sum is σ = 218438765056000. Its totient is φ = 125543888426880.

The previous prime is 166500155605939. The next prime is 166500155605997. The reversal of 166500155605975 is 579506551005661.

It is a happy number.

It is not a de Polignac number, because 166500155605975 - 2¹⁵ = 166500155573207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1103693002 + ... + 1103843848.

Almost surely, 2^{166500155605975} is an apocalyptic number.

166500155605975 is a deficient number, since it is larger than the sum of its proper divisors (51938609450025).

166500155605975 is a wasteful number, since it uses less digits than its factorization.

166500155605975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162752 (or 162747 counting only the distinct ones).

The product of its (nonzero) digits is 42525000, while the sum is 61.

The spelling of 166500155605975 in words is "one hundred sixty-six trillion, five hundred billion, one hundred fifty-five million, six hundred five thousand, nine hundred seventy-five".