166280803920 has 1440 divisors, whose sum is σ = 762069724416. Its totient is φ = 31677972480.

The previous prime is 166280803889. The next prime is 166280803943. The reversal of 166280803920 is 29308082661.

166280803920 is a `hidden beast` number, since 16 + 628 + 0 + 8 + 0 + 3 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 445792854 + ... + 445793226.

Almost surely, 2^166280803920 is an apocalyptic number.

166280803920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166280803920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381034862208).

166280803920 is an abundant number, since it is smaller than the sum of its proper divisors (595788920496).

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

166280803920 is a wasteful number, since it uses less digits than its factorization.

166280803920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 166280803920 in words is "one hundred sixty-six billion, two hundred eighty million, eight hundred three thousand, nine hundred twenty".