666394848 has 144 divisors (see below), whose sum is σ = 2235856896. Its totient is φ = 184239360.

The previous prime is 666394843. The next prime is 666394873. The reversal of 666394848 is 848493666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 666394794 and 666394803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666394843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57165 + ... + 67827.

It is an arithmetic number, because the mean of its divisors is an integer number (15526784).

Almost surely, 2^666394848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666394848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117928448).

666394848 is an abundant number, since it is smaller than the sum of its proper divisors (1569462048).

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

666394848 is a wasteful number, since it uses less digits than its factorization.

666394848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717 (or 10706 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 666394848 is about 25814.6246922166. The cubic root of 666394848 is about 873.4617208579.

The spelling of 666394848 in words is "six hundred sixty-six million, three hundred ninety-four thousand, eight hundred forty-eight".