27571772161 has 2 divisors, whose sum is σ = 27571772162. Its totient is φ = 27571772160.

The previous prime is 27571772141. The next prime is 27571772191. The reversal of 27571772161 is 16127717572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15321488400 + 12250283761 = 123780^2 + 110681^2 .

It is a cyclic number.

It is not a de Polignac number, because 27571772161 - 2¹³ = 27571763969 is a prime.

It is not a weakly prime, because it can be changed into another prime (27571772141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13785886080 + 13785886081.

It is an arithmetic number, because the mean of its divisors is an integer number (13785886081).

Almost surely, 2^27571772161 is an apocalyptic number.

It is an amenable number.

27571772161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27571772161 is an equidigital number, since it uses as much as digits as its factorization.

27571772161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288120, while the sum is 46.

The spelling of 27571772161 in words is "twenty-seven billion, five hundred seventy-one million, seven hundred seventy-two thousand, one hundred sixty-one".