66800668 has 24 divisors (see below), whose sum is σ = 128306304. Its totient is φ = 30178800.

The previous prime is 66800647. The next prime is 66800681. The reversal of 66800668 is 86600866.

It is a self number, because there is not a number n which added to its sum of digits gives 66800668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2803 + ... + 11893.

It is an arithmetic number, because the mean of its divisors is an integer number (5346096).

Almost surely, 2^66800668 is an apocalyptic number.

It is an amenable number.

66800668 is a deficient number, since it is larger than the sum of its proper divisors (61505636).

66800668 is a wasteful number, since it uses less digits than its factorization.

66800668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9273 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 66800668 is about 8173.1675622123. The cubic root of 66800668 is about 405.7516256099.

It can be divided in two parts, 66800 and 668, that multiplied together give a square (44622400 = 6680²).

The spelling of 66800668 in words is "sixty-six million, eight hundred thousand, six hundred sixty-eight".