166439389800 has 48 divisors (see below), whose sum is σ = 515962110240. Its totient is φ = 44383837120.

The previous prime is 166439389789. The next prime is 166439389861. The reversal of 166439389800 is 8983934661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138698892 + ... + 138700091.

It is an arithmetic number, because the mean of its divisors is an integer number (10749210630).

Almost surely, 2^166439389800 is an apocalyptic number.

166439389800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166439389800 is an abundant number, since it is smaller than the sum of its proper divisors (349522720440).

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

166439389800 is a wasteful number, since it uses less digits than its factorization.

166439389800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277399002 (or 277398993 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 166439389800 in words is "one hundred sixty-six billion, four hundred thirty-nine million, three hundred eighty-nine thousand, eight hundred".