669417976310769 has 81 divisors (see below), whose sum is σ = 1127066620506489. Its totient is φ = 381756747390480.

The previous prime is 669417976310761. The next prime is 669417976310771. The reversal of 669417976310769 is 967013679714966.

The square root of 669417976310769 is 25873113.

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

669417976310769 is a `hidden beast` number, since 6 + 6 + 9 + 4 + 179 + 76 + 310 + 7 + 69 = 666.

It is not a de Polignac number, because 669417976310769 - 2³ = 669417976310761 is a prime.

It is a super-2 number, since 2×669417976310769² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669417976310761) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 375444741852 + ... + 375444743634.

Almost surely, 2^{669417976310769} is an apocalyptic number.

669417976310769 is the 25873113-rd square number.

669417976310769 is the 12936557-th centered octagonal number.

It is an amenable number.

669417976310769 is a deficient number, since it is larger than the sum of its proper divisors (457648644195720).

669417976310769 is an frugal number, since it uses more digits than its factorization.

669417976310769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4968 (or 2484 counting only the distinct ones).

The product of its (nonzero) digits is 3888730944, while the sum is 81.

The spelling of 669417976310769 in words is "six hundred sixty-nine trillion, four hundred seventeen billion, nine hundred seventy-six million, three hundred ten thousand, seven hundred sixty-nine".