27771605831 has 2 divisors, whose sum is σ = 27771605832. Its totient is φ = 27771605830.

The previous prime is 27771605819. The next prime is 27771605833. The reversal of 27771605831 is 13850617772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27771605831 - 2¹⁰ = 27771604807 is a prime.

It is a super-2 number, since 2×27771605831² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 27771605833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771605833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885802915 + 13885802916.

It is an arithmetic number, because the mean of its divisors is an integer number (13885802916).

Almost surely, 2^27771605831 is an apocalyptic number.

27771605831 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771605831 is an equidigital number, since it uses as much as digits as its factorization.

27771605831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920, while the sum is 47.

The spelling of 27771605831 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred five thousand, eight hundred thirty-one".