27172555281 has 27 divisors (see below), whose sum is σ = 41047112379. Its totient is φ = 17320173552.

The previous prime is 27172555273. The next prime is 27172555303. The reversal of 27172555281 is 18255527172.

The square root of 27172555281 is 164841.

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

27172555281 is a `hidden beast` number, since 2 + 7 + 1 + 72 + 55 + 528 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6176545281 + 20996010000 = 78591^2 + 144900^2 .

It is not a de Polignac number, because 27172555281 - 2³ = 27172555273 is a prime.

It is a super-2 number, since 2×27172555281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27172455281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11372835 + ... + 11375223.

Almost surely, 2^27172555281 is an apocalyptic number.

27172555281 is the 164841-st square number.

27172555281 is the 82421-st centered octagonal number.

It is an amenable number.

27172555281 is a deficient number, since it is larger than the sum of its proper divisors (13874557098).

27172555281 is an frugal number, since it uses more digits than its factorization.

27172555281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830 (or 2415 counting only the distinct ones).

The product of its digits is 392000, while the sum is 45.

The spelling of 27172555281 in words is "twenty-seven billion, one hundred seventy-two million, five hundred fifty-five thousand, two hundred eighty-one".