669666323216 has 40 divisors (see below), whose sum is σ = 1430023201824. Its totient is φ = 301255695360.

The previous prime is 669666323171. The next prime is 669666323239. The reversal of 669666323216 is 612323666966.

669666323216 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 7 ways as a sum of consecutive naturals, for example, 19595930 + ... + 19630073.

Almost surely, 2^669666323216 is an apocalyptic number.

It is an amenable number.

669666323216 is an abundant number, since it is smaller than the sum of its proper divisors (760356878608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669666323216 is a wasteful number, since it uses less digits than its factorization.

669666323216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39226119 (or 39226113 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 56.

The spelling of 669666323216 in words is "six hundred sixty-nine billion, six hundred sixty-six million, three hundred twenty-three thousand, two hundred sixteen".