166658555396 has 6 divisors (see below), whose sum is σ = 291652471950. Its totient is φ = 83329277696.

The previous prime is 166658555369. The next prime is 166658555477. The reversal of 166658555396 is 693555856661.

It can be written as a sum of positive squares in only one way, i.e., 165538314496 + 1120240900 = 406864^2 + 33470^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20832319421 + ... + 20832319428.

It is an arithmetic number, because the mean of its divisors is an integer number (48608745325).

Almost surely, 2^166658555396 is an apocalyptic number.

It is an amenable number.

166658555396 is a deficient number, since it is larger than the sum of its proper divisors (124993916554).

166658555396 is a wasteful number, since it uses less digits than its factorization.

166658555396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41664638853 (or 41664638851 counting only the distinct ones).

The product of its digits is 174960000, while the sum is 65.

The spelling of 166658555396 in words is "one hundred sixty-six billion, six hundred fifty-eight million, five hundred fifty-five thousand, three hundred ninety-six".