166921023305 has 16 divisors (see below), whose sum is σ = 200507346000. Its totient is φ = 133402156800.

The previous prime is 166921023301. The next prime is 166921023307. The reversal of 166921023305 is 503320129661.

It can be written as a sum of positive squares in 8 ways, for example, as 1379453881 + 165541569424 = 37141^2 + 406868^2 .

It is not a de Polignac number, because 166921023305 - 2² = 166921023301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166921023301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32165651 + ... + 32170839.

It is an arithmetic number, because the mean of its divisors is an integer number (12531709125).

Almost surely, 2^166921023305 is an apocalyptic number.

It is an amenable number.

166921023305 is a deficient number, since it is larger than the sum of its proper divisors (33586322695).

166921023305 is a wasteful number, since it uses less digits than its factorization.

166921023305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10444.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 166921023305 in words is "one hundred sixty-six billion, nine hundred twenty-one million, twenty-three thousand, three hundred five".