217966958946 has 72 divisors (see below), whose sum is σ = 541667206080. Its totient is φ = 63178814160.

The previous prime is 217966958921. The next prime is 217966958959. The reversal of 217966958946 is 649859669712.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2125486 + ... + 2225673.

It is an arithmetic number, because the mean of its divisors is an integer number (7523155640).

Almost surely, 2^217966958946 is an apocalyptic number.

217966958946 is an abundant number, since it is smaller than the sum of its proper divisors (323700247134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217966958946 is a wasteful number, since it uses less digits than its factorization.

217966958946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351212 (or 4351198 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 217966958946 in words is "two hundred seventeen billion, nine hundred sixty-six million, nine hundred fifty-eight thousand, nine hundred forty-six".