166921023306 has 16 divisors (see below), whose sum is σ = 333855101664. Its totient is φ = 55638165264.

The previous prime is 166921023301. The next prime is 166921023307. The reversal of 166921023306 is 603320129661.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 373641 + ... + 688076.

It is an arithmetic number, because the mean of its divisors is an integer number (20865943854).

Almost surely, 2^166921023306 is an apocalyptic number.

166921023306 is an abundant number, since it is smaller than the sum of its proper divisors (166934078358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166921023306 is a wasteful number, since it uses less digits than its factorization.

166921023306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087925.

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 166921023306 in words is "one hundred sixty-six billion, nine hundred twenty-one million, twenty-three thousand, three hundred six".