217023010542661 has 2 divisors, whose sum is σ = 217023010542662. Its totient is φ = 217023010542660.

The previous prime is 217023010542631. The next prime is 217023010542703. The reversal of 217023010542661 is 166245010320712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112811886234436 + 104211124308225 = 10621294^2 + 10208385^2 .

It is a cyclic number.

It is not a de Polignac number, because 217023010542661 - 2⁵ = 217023010542629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217023010542631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108511505271330 + 108511505271331.

It is an arithmetic number, because the mean of its divisors is an integer number (108511505271331).

Almost surely, 2^{217023010542661} is an apocalyptic number.

It is an amenable number.

217023010542661 is a deficient number, since it is larger than the sum of its proper divisors (1).

217023010542661 is an equidigital number, since it uses as much as digits as its factorization.

217023010542661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 217023010542661 in words is "two hundred seventeen trillion, twenty-three billion, ten million, five hundred forty-two thousand, six hundred sixty-one".