166407426117220 has 12 divisors (see below), whose sum is σ = 349455594846204. Its totient is φ = 66562970446880.

The previous prime is 166407426117193. The next prime is 166407426117221. The reversal of 166407426117220 is 22711624704661.

It can be written as a sum of positive squares in 2 ways, for example, as 117690906919936 + 48716519197284 = 10848544^2 + 6979722^2 .

It is not an unprimeable number, because it can be changed into a prime (166407426117221) 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, 4160185652911 + ... + 4160185652950.

It is an arithmetic number, because the mean of its divisors is an integer number (29121299570517).

Almost surely, 2^{166407426117220} is an apocalyptic number.

166407426117220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166407426117220 is an abundant number, since it is smaller than the sum of its proper divisors (183048168728984).

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

166407426117220 is a wasteful number, since it uses less digits than its factorization.

166407426117220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8320371305870 (or 8320371305868 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 166407426117220 in words is "one hundred sixty-six trillion, four hundred seven billion, four hundred twenty-six million, one hundred seventeen thousand, two hundred twenty".