166645231658 has 8 divisors (see below), whose sum is σ = 250481129952. Its totient is φ = 83151521676.

The previous prime is 166645231657. The next prime is 166645231681. The reversal of 166645231658 is 856132546661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166645231651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85545860 + ... + 85547807.

It is an arithmetic number, because the mean of its divisors is an integer number (31310141244).

Almost surely, 2^166645231658 is an apocalyptic number.

166645231658 is a deficient number, since it is larger than the sum of its proper divisors (83835898294).

166645231658 is a wasteful number, since it uses less digits than its factorization.

166645231658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171094156.

The product of its digits is 6220800, while the sum is 53.

The spelling of 166645231658 in words is "one hundred sixty-six billion, six hundred forty-five million, two hundred thirty-one thousand, six hundred fifty-eight".