217380663 has 6 divisors (see below), whose sum is σ = 313994304. Its totient is φ = 144920436.

The previous prime is 217380557. The next prime is 217380671. The reversal of 217380663 is 366083712.

It is a happy number.

217380663 is a `hidden beast` number, since 217 + 380 + 6 + 63 = 666.

It is not a de Polignac number, because 217380663 - 2¹⁸ = 217118519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217380263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12076695 + ... + 12076712.

It is an arithmetic number, because the mean of its divisors is an integer number (52332384).

Almost surely, 2^217380663 is an apocalyptic number.

217380663 is a deficient number, since it is larger than the sum of its proper divisors (96613641).

217380663 is a wasteful number, since it uses less digits than its factorization.

217380663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24153413 (or 24153410 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 217380663 is about 14743.8347454114. The cubic root of 217380663 is about 601.2756774894.

The spelling of 217380663 in words is "two hundred seventeen million, three hundred eighty thousand, six hundred sixty-three".