669686180728 has 8 divisors (see below), whose sum is σ = 1255661588880. Its totient is φ = 334843090360.

The previous prime is 669686180711. The next prime is 669686180743. The reversal of 669686180728 is 827081686966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41855386288 + ... + 41855386303.

It is an arithmetic number, because the mean of its divisors is an integer number (156957698610).

Almost surely, 2^669686180728 is an apocalyptic number.

It is an amenable number.

669686180728 is a deficient number, since it is larger than the sum of its proper divisors (585975408152).

669686180728 is a wasteful number, since it uses less digits than its factorization.

669686180728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83710772597 (or 83710772593 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 67.

The spelling of 669686180728 in words is "six hundred sixty-nine billion, six hundred eighty-six million, one hundred eighty thousand, seven hundred twenty-eight".