27543053521 has 3 divisors (see below), whose sum is σ = 27543219483. Its totient is φ = 27542887560.

The previous prime is 27543053497. The next prime is 27543053597. The reversal of 27543053521 is 12535034572.

It is a happy number.

The square root of 27543053521 is 165961.

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 can be written as a sum of positive squares in only one way, i.e., 26272843921 + 1270209600 = 162089^2 + 35640^2 .

It is not a de Polignac number, because 27543053521 - 2¹⁵ = 27543020753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27543053221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 82981 + ... + 248941.

It is an arithmetic number, because the mean of its divisors is an integer number (9181073161).

Almost surely, 2^27543053521 is an apocalyptic number.

27543053521 is the 165961-st square number.

27543053521 is the 82981-st centered octagonal number.

It is an amenable number.

27543053521 is a deficient number, since it is larger than the sum of its proper divisors (165962).

27543053521 is an frugal number, since it uses more digits than its factorization.

27543053521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331922 (or 165961 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 27543053521 in words is "twenty-seven billion, five hundred forty-three million, fifty-three thousand, five hundred twenty-one".