27540172817 has 2 divisors, whose sum is σ = 27540172818. Its totient is φ = 27540172816.

The previous prime is 27540172789. The next prime is 27540172841. The reversal of 27540172817 is 71827104572.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26696618881 + 843553936 = 163391^2 + 29044^2 .

It is a cyclic number.

It is not a de Polignac number, because 27540172817 - 2¹⁰ = 27540171793 is a prime.

It is a super-2 number, since 2×27540172817² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27540172867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13770086408 + 13770086409.

It is an arithmetic number, because the mean of its divisors is an integer number (13770086409).

Almost surely, 2^27540172817 is an apocalyptic number.

It is an amenable number.

27540172817 is a deficient number, since it is larger than the sum of its proper divisors (1).

27540172817 is an equidigital number, since it uses as much as digits as its factorization.

27540172817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219520, while the sum is 44.

The spelling of 27540172817 in words is "twenty-seven billion, five hundred forty million, one hundred seventy-two thousand, eight hundred seventeen".