666666648 has 48 divisors (see below), whose sum is σ = 1839633120. Its totient is φ = 218028096.

The previous prime is 666666647. The next prime is 666666653. The reversal of 666666648 is 846666666.

666666648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 666666594 and 666666603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83536 + ... + 91167.

It is an arithmetic number, because the mean of its divisors is an integer number (38325690).

Almost surely, 2^666666648 is an apocalyptic number.

It is an amenable number.

666666648 is an abundant number, since it is smaller than the sum of its proper divisors (1172966472).

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

666666648 is a wasteful number, since it uses less digits than its factorization.

666666648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174768 (or 174761 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The square root of 666666648 is about 25819.8886132377. Note that the first 3 decimals coincide. The cubic root of 666666648 is about 873.5804565829.

The spelling of 666666648 in words is "six hundred sixty-six million, six hundred sixty-six thousand, six hundred forty-eight".