27756431971 has 2 divisors, whose sum is σ = 27756431972. Its totient is φ = 27756431970.

The previous prime is 27756431959. The next prime is 27756432013. The reversal of 27756431971 is 17913465772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27756431971 - 2²¹ = 27754334819 is a prime.

It is not a weakly prime, because it can be changed into another prime (27756431921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13878215985 + 13878215986.

It is an arithmetic number, because the mean of its divisors is an integer number (13878215986).

Almost surely, 2^27756431971 is an apocalyptic number.

27756431971 is a deficient number, since it is larger than the sum of its proper divisors (1).

27756431971 is an equidigital number, since it uses as much as digits as its factorization.

27756431971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 52.

The spelling of 27756431971 in words is "twenty-seven billion, seven hundred fifty-six million, four hundred thirty-one thousand, nine hundred seventy-one".