669834212356 has 9 divisors (see below), whose sum is σ = 1172212736149. Its totient is φ = 334916287744.

The previous prime is 669834212353. The next prime is 669834212393. The reversal of 669834212356 is 653212438966.

The square root of 669834212356 is 818434.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9866448900 + 659967763456 = 99330^2 + 812384^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669834212297 and 669834212306.

It is not an unprimeable number, because it can be changed into a prime (669834212353) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1432260 + ... + 1841476.

Almost surely, 2^669834212356 is an apocalyptic number.

669834212356 is the 818434-th square number.

It is an amenable number.

669834212356 is a deficient number, since it is larger than the sum of its proper divisors (502378523793).

669834212356 is an frugal number, since it uses more digits than its factorization.

669834212356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818438 (or 409219 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 55.

The spelling of 669834212356 in words is "six hundred sixty-nine billion, eight hundred thirty-four million, two hundred twelve thousand, three hundred fifty-six".