217640805471503 has 2 divisors, whose sum is σ = 217640805471504. Its totient is φ = 217640805471502.

The previous prime is 217640805471487. The next prime is 217640805471553. The reversal of 217640805471503 is 305174508046712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217640805471503 - 2⁴ = 217640805471487 is a prime.

It is a super-2 number, since 2×217640805471503² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217640805471553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108820402735751 + 108820402735752.

It is an arithmetic number, because the mean of its divisors is an integer number (108820402735752).

Almost surely, 2^{217640805471503} is an apocalyptic number.

217640805471503 is a deficient number, since it is larger than the sum of its proper divisors (1).

217640805471503 is an equidigital number, since it uses as much as digits as its factorization.

217640805471503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 217640805471503 in words is "two hundred seventeen trillion, six hundred forty billion, eight hundred five million, four hundred seventy-one thousand, five hundred three".