27721612771 has 2 divisors, whose sum is σ = 27721612772. Its totient is φ = 27721612770.

The previous prime is 27721612759. The next prime is 27721612801. The reversal of 27721612771 is 17721612772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27721612771 - 2²¹ = 27719515619 is a prime.

It is not a weakly prime, because it can be changed into another prime (27721612271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860806385 + 13860806386.

It is an arithmetic number, because the mean of its divisors is an integer number (13860806386).

Almost surely, 2^27721612771 is an apocalyptic number.

27721612771 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721612771 is an equidigital number, since it uses as much as digits as its factorization.

27721612771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115248, while the sum is 43.

Subtracting from 27721612771 its reverse (17721612772), we obtain a palindrome (9999999999).

The spelling of 27721612771 in words is "twenty-seven billion, seven hundred twenty-one million, six hundred twelve thousand, seven hundred seventy-one".