166363720172 has 12 divisors (see below), whose sum is σ = 313531626576. Its totient is φ = 76783255440.

The previous prime is 166363720169. The next prime is 166363720177. The reversal of 166363720172 is 271027363661.

It is not an unprimeable number, because it can be changed into a prime (166363720177) 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, 1599651104 + ... + 1599651207.

It is an arithmetic number, because the mean of its divisors is an integer number (26127635548).

Almost surely, 2^166363720172 is an apocalyptic number.

It is an amenable number.

166363720172 is a deficient number, since it is larger than the sum of its proper divisors (147167906404).

166363720172 is a wasteful number, since it uses less digits than its factorization.

166363720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199302328 (or 3199302326 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 166363720172 in words is "one hundred sixty-six billion, three hundred sixty-three million, seven hundred twenty thousand, one hundred seventy-two".