6669647144356 has 81 divisors (see below), whose sum is σ = 14064040934307. Its totient is φ = 2759420119680.

The previous prime is 6669647144353. The next prime is 6669647144399. The reversal of 6669647144356 is 6534417469666.

The square root of 6669647144356 is 2582566.

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

It can be written as a sum of positive squares in 4 ways, for example, as 379783782756 + 6289863361600 = 616266^2 + 2507960^2 .

It is a super-2 number, since 2×6669647144356² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6669647144291 and 6669647144300.

It is not an unprimeable number, because it can be changed into a prime (6669647144353) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1048518616 + ... + 1048524976.

Almost surely, 2^{6669647144356} is an apocalyptic number.

6669647144356 is the 2582566-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6669647144356

6669647144356 is an abundant number, since it is smaller than the sum of its proper divisors (7394393789951).

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

6669647144356 is an frugal number, since it uses more digits than its factorization.

6669647144356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12798 (or 6399 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 67.

The spelling of 6669647144356 in words is "six trillion, six hundred sixty-nine billion, six hundred forty-seven million, one hundred forty-four thousand, three hundred fifty-six".