27540172789 has 2 divisors, whose sum is σ = 27540172790. Its totient is φ = 27540172788.

The previous prime is 27540172729. The next prime is 27540172817. The reversal of 27540172789 is 98727104572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26564110225 + 976062564 = 162985^2 + 31242^2 .

It is a cyclic number.

It is not a de Polignac number, because 27540172789 - 2²⁹ = 27003301877 is a prime.

It is a super-2 number, since 2×27540172789² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27540172729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13770086394 + 13770086395.

It is an arithmetic number, because the mean of its divisors is an integer number (13770086395).

Almost surely, 2^27540172789 is an apocalyptic number.

It is an amenable number.

27540172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

27540172789 is an equidigital number, since it uses as much as digits as its factorization.

27540172789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 27540172789 in words is "twenty-seven billion, five hundred forty million, one hundred seventy-two thousand, seven hundred eighty-nine".