6552775705921 has 3 divisors (see below), whose sum is σ = 6552778265761. Its totient is φ = 6552773146082.

The previous prime is 6552775705843. The next prime is 6552775705961. The reversal of 6552775705921 is 1295075772556.

The square root of 6552775705921 is 2559839.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 6552775705921 - 2¹³ = 6552775697729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6552775705921.

It is not an unprimeable number, because it can be changed into a prime (6552775705961) 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, 1279920 + ... + 3839758.

Almost surely, 2^{6552775705921} is an apocalyptic number.

6552775705921 is the 2559839-th square number.

6552775705921 is the 1279920-th centered octagonal number.

It is an amenable number.

6552775705921 is a deficient number, since it is larger than the sum of its proper divisors (2559840).

6552775705921 is an frugal number, since it uses more digits than its factorization.

6552775705921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119678 (or 2559839 counting only the distinct ones).

The product of its (nonzero) digits is 46305000, while the sum is 61.

The spelling of 6552775705921 in words is "six trillion, five hundred fifty-two billion, seven hundred seventy-five million, seven hundred five thousand, nine hundred twenty-one".