1668812792556 has 96 divisors (see below), whose sum is σ = 4853152675840. Its totient is φ = 434555207424.

The previous prime is 1668812792531. The next prime is 1668812792557. The reversal of 1668812792556 is 6552972188661.

It is a super-2 number, since 2×1668812792556² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1668812792557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9585991 + ... + 9758526.

Almost surely, 2^{1668812792556} is an apocalyptic number.

It is an amenable number.

1668812792556 is an abundant number, since it is smaller than the sum of its proper divisors (3184339883284).

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

1668812792556 is a wasteful number, since it uses less digits than its factorization.

1668812792556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19344623 (or 19344621 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 66.

The spelling of 1668812792556 in words is "one trillion, six hundred sixty-eight billion, eight hundred twelve million, seven hundred ninety-two thousand, five hundred fifty-six".