27771641591 has 2 divisors, whose sum is σ = 27771641592. Its totient is φ = 27771641590.

The previous prime is 27771641549. The next prime is 27771641603. The reversal of 27771641591 is 19514617772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27771641591 - 2²⁶ = 27704532727 is a prime.

It is a super-2 number, since 2×27771641591² (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 (27771641501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885820795 + 13885820796.

It is an arithmetic number, because the mean of its divisors is an integer number (13885820796).

Almost surely, 2^27771641591 is an apocalyptic number.

27771641591 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771641591 is an equidigital number, since it uses as much as digits as its factorization.

27771641591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 50.

The spelling of 27771641591 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty-one thousand, five hundred ninety-one".