648221166 has 48 divisors (see below), whose sum is σ = 1472898960. Its totient is φ = 205752960.

The previous prime is 648221099. The next prime is 648221179. The reversal of 648221166 is 661122846.

648221166 is a `hidden beast` number, since 648 + 2 + 2 + 1 + 1 + 6 + 6 = 666.

648221166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 648221166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29601 + ... + 46611.

It is an arithmetic number, because the mean of its divisors is an integer number (30685395).

Almost surely, 2^648221166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648221166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736449480).

648221166 is an abundant number, since it is smaller than the sum of its proper divisors (824677794).

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

648221166 is a wasteful number, since it uses less digits than its factorization.

648221166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17121 (or 17118 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 648221166 is about 25460.1878626219. The cubic root of 648221166 is about 865.4481805443.

The spelling of 648221166 in words is "six hundred forty-eight million, two hundred twenty-one thousand, one hundred sixty-six".