666687548 has 6 divisors (see below), whose sum is σ = 1166703216. Its totient is φ = 333343772.

The previous prime is 666687517. The next prime is 666687569. The reversal of 666687548 is 845786666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 666687493 and 666687502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83335940 + ... + 83335947.

It is an arithmetic number, because the mean of its divisors is an integer number (194450536).

Almost surely, 2^666687548 is an apocalyptic number.

It is an amenable number.

666687548 is a deficient number, since it is larger than the sum of its proper divisors (500015668).

666687548 is a wasteful number, since it uses less digits than its factorization.

666687548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166671891 (or 166671889 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 56.

The square root of 666687548 is about 25820.2933368310. The cubic root of 666687548 is about 873.5895854035.

The spelling of 666687548 in words is "six hundred sixty-six million, six hundred eighty-seven thousand, five hundred forty-eight".