217945606939 has 8 divisors (see below), whose sum is σ = 222537419712. Its totient is φ = 213371558400.

The previous prime is 217945606937. The next prime is 217945606979. The reversal of 217945606939 is 939606549712.

217945606939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217945606939 - 2¹ = 217945606937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217945606937) 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 7 ways as a sum of consecutive naturals, for example, 4416262 + ... + 4465339.

It is an arithmetic number, because the mean of its divisors is an integer number (27817177464).

Almost surely, 2^217945606939 is an apocalyptic number.

217945606939 is a deficient number, since it is larger than the sum of its proper divisors (4591812773).

217945606939 is an equidigital number, since it uses as much as digits as its factorization.

217945606939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8882117.

The product of its (nonzero) digits is 22044960, while the sum is 61.

The spelling of 217945606939 in words is "two hundred seventeen billion, nine hundred forty-five million, six hundred six thousand, nine hundred thirty-nine".