166500155605994 has 48 divisors (see below), whose sum is σ = 305820099537120. Its totient is φ = 67600796084640.

The previous prime is 166500155605939. The next prime is 166500155605997. The reversal of 166500155605994 is 499506551005661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166500155605997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179979464 + ... + 180902204.

It is an arithmetic number, because the mean of its divisors is an integer number (6371252073690).

Almost surely, 2^{166500155605994} is an apocalyptic number.

166500155605994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166500155605994 is a deficient number, since it is larger than the sum of its proper divisors (139319943931126).

166500155605994 is a wasteful number, since it uses less digits than its factorization.

166500155605994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019683 (or 1019676 counting only the distinct ones).

The product of its (nonzero) digits is 43740000, while the sum is 62.

The spelling of 166500155605994 in words is "one hundred sixty-six trillion, five hundred billion, one hundred fifty-five million, six hundred five thousand, nine hundred ninety-four".