6669561309508 has 6 divisors (see below), whose sum is σ = 11671732291646. Its totient is φ = 3334780654752.

The previous prime is 6669561309497. The next prime is 6669561309511. The reversal of 6669561309508 is 8059031659666.

It can be written as a sum of positive squares in only one way, i.e., 6108767014464 + 560794295044 = 2471592^2 + 748862^2 .

It is a super-2 number, since 2×6669561309508² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6669561309508.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833695163685 + ... + 833695163692.

Almost surely, 2^{6669561309508} is an apocalyptic number.

It is an amenable number.

6669561309508 is a deficient number, since it is larger than the sum of its proper divisors (5002170982138).

6669561309508 is a wasteful number, since it uses less digits than its factorization.

6669561309508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667390327381 (or 1667390327379 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 64.

The spelling of 6669561309508 in words is "six trillion, six hundred sixty-nine billion, five hundred sixty-one million, three hundred nine thousand, five hundred eight".