27743205397 has 2 divisors, whose sum is σ = 27743205398. Its totient is φ = 27743205396.

The previous prime is 27743205361. The next prime is 27743205409. The reversal of 27743205397 is 79350234772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26326360516 + 1416844881 = 162254^2 + 37641^2 .

It is a cyclic number.

It is not a de Polignac number, because 27743205397 - 2²⁷ = 27608987669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27743205397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27743205197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13871602698 + 13871602699.

It is an arithmetic number, because the mean of its divisors is an integer number (13871602699).

Almost surely, 2^27743205397 is an apocalyptic number.

It is an amenable number.

27743205397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27743205397 is an equidigital number, since it uses as much as digits as its factorization.

27743205397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 49.

The spelling of 27743205397 in words is "twenty-seven billion, seven hundred forty-three million, two hundred five thousand, three hundred ninety-seven".