217705975331441 has 2 divisors, whose sum is σ = 217705975331442. Its totient is φ = 217705975331440.

The previous prime is 217705975331431. The next prime is 217705975331483. The reversal of 217705975331441 is 144133579507712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168348030010000 + 49357945321441 = 12974900^2 + 7025521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217705975331441 is a prime.

It is not a weakly prime, because it can be changed into another prime (217705975331431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108852987665720 + 108852987665721.

It is an arithmetic number, because the mean of its divisors is an integer number (108852987665721).

Almost surely, 2^{217705975331441} is an apocalyptic number.

It is an amenable number.

217705975331441 is a deficient number, since it is larger than the sum of its proper divisors (1).

217705975331441 is an equidigital number, since it uses as much as digits as its factorization.

217705975331441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22226400, while the sum is 59.

The spelling of 217705975331441 in words is "two hundred seventeen trillion, seven hundred five billion, nine hundred seventy-five million, three hundred thirty-one thousand, four hundred forty-one".