5581212526681 has 27 divisors (see below), whose sum is σ = 6164139733437. Its totient is φ = 5049614364960.

The previous prime is 5581212526657. The next prime is 5581212526739. The reversal of 5581212526681 is 1866252121855.

The square root of 5581212526681 is 2362459.

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 4805262952281 + 775949574400 = 2192091^2 + 880880^2 .

It is not a de Polignac number, because 5581212526681 - 2¹¹ = 5581212524633 is a prime.

It is a super-2 number, since 2×5581212526681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5581212526781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7614204991 + ... + 7614205723.

Almost surely, 2^{5581212526681} is an apocalyptic number.

5581212526681 is the 2362459-th square number.

5581212526681 is the 1181230-th centered octagonal number.

It is an amenable number.

5581212526681 is a deficient number, since it is larger than the sum of its proper divisors (582927206756).

5581212526681 is an frugal number, since it uses more digits than its factorization.

5581212526681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 1037 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 52.

The spelling of 5581212526681 in words is "five trillion, five hundred eighty-one billion, two hundred twelve million, five hundred twenty-six thousand, six hundred eighty-one".