27568949521 has 9 divisors (see below), whose sum is σ = 29289045499. Its totient is φ = 25944589984.

The previous prime is 27568949503. The next prime is 27568949537. The reversal of 27568949521 is 12594986572.

It is a happy number.

The square root of 27568949521 is 166039.

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

It can be written as a sum of positive squares in only one way, i.e., 21463715025 + 6105234496 = 146505^2 + 78136^2 .

It is not a de Polignac number, because 27568949521 - 2²³ = 27560560913 is a prime.

It is a super-2 number, since 2×27568949521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27568949501) 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 8 ways as a sum of consecutive naturals, for example, 2817780 + ... + 2827546.

Almost surely, 2^27568949521 is an apocalyptic number.

27568949521 is the 166039-th square number.

27568949521 is the 83020-th centered octagonal number.

It is an amenable number.

27568949521 is a deficient number, since it is larger than the sum of its proper divisors (1720095978).

27568949521 is an frugal number, since it uses more digits than its factorization.

27568949521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19568 (or 9784 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 27568949521 in words is "twenty-seven billion, five hundred sixty-eight million, nine hundred forty-nine thousand, five hundred twenty-one".