666673648 has 20 divisors (see below), whose sum is σ = 1303533880. Its totient is φ = 330277824.

The previous prime is 666673643. The next prime is 666673669. The reversal of 666673648 is 846376666.

It is a super-3 number, since 3×666673648³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666673595 and 666673604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666673643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189390 + ... + 192877.

It is an arithmetic number, because the mean of its divisors is an integer number (65176694).

Almost surely, 2^666673648 is an apocalyptic number.

It is an amenable number.

666673648 is a deficient number, since it is larger than the sum of its proper divisors (636860232).

666673648 is a wasteful number, since it uses less digits than its factorization.

666673648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382384 (or 382378 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 52.

The square root of 666673648 is about 25820.0241673009. The cubic root of 666673648 is about 873.5835141039.

The spelling of 666673648 in words is "six hundred sixty-six million, six hundred seventy-three thousand, six hundred forty-eight".