669993622645 has 4 divisors (see below), whose sum is σ = 803992347180. Its totient is φ = 535994898112.

The previous prime is 669993622631. The next prime is 669993622651. The reversal of 669993622645 is 546226399966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 350626226769 + 319367395876 = 592137^2 + 565126^2 .

It is a cyclic number.

It is not a de Polignac number, because 669993622645 - 2³¹ = 667846138997 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 66999362260 + ... + 66999362269.

It is an arithmetic number, because the mean of its divisors is an integer number (200998086795).

Almost surely, 2^669993622645 is an apocalyptic number.

It is an amenable number.

669993622645 is a deficient number, since it is larger than the sum of its proper divisors (133998724535).

669993622645 is a wasteful number, since it uses less digits than its factorization.

669993622645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133998724534.

The product of its digits is 226748160, while the sum is 67.

The spelling of 669993622645 in words is "six hundred sixty-nine billion, nine hundred ninety-three million, six hundred twenty-two thousand, six hundred forty-five".