666551624 has 16 divisors (see below), whose sum is σ = 1250121600. Its totient is φ = 333185872.

The previous prime is 666551591. The next prime is 666551651. The reversal of 666551624 is 426155666.

666551624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28529 + ... + 46335.

It is an arithmetic number, because the mean of its divisors is an integer number (78132600).

Almost surely, 2^666551624 is an apocalyptic number.

It is an amenable number.

666551624 is a deficient number, since it is larger than the sum of its proper divisors (583569976).

666551624 is a wasteful number, since it uses less digits than its factorization.

666551624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22492 (or 22488 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 666551624 is about 25817.6610869381. The cubic root of 666551624 is about 873.5302123325.

The spelling of 666551624 in words is "six hundred sixty-six million, five hundred fifty-one thousand, six hundred twenty-four".