217042578983 has 4 divisors (see below), whose sum is σ = 217044227400. Its totient is φ = 217040930568.

The previous prime is 217042578979. The next prime is 217042579057. The reversal of 217042578983 is 389875240712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217042578983 - 2² = 217042578979 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217042578923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607760 + ... + 896357.

It is an arithmetic number, because the mean of its divisors is an integer number (54261056850).

Almost surely, 2^217042578983 is an apocalyptic number.

217042578983 is a deficient number, since it is larger than the sum of its proper divisors (1648417).

217042578983 is a wasteful number, since it uses less digits than its factorization.

217042578983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648416.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 217042578983 in words is "two hundred seventeen billion, forty-two million, five hundred seventy-eight thousand, nine hundred eighty-three".