217920598968 has 16 divisors (see below), whose sum is σ = 544801497480. Its totient is φ = 72640199648.

The previous prime is 217920598949. The next prime is 217920599011. The reversal of 217920598968 is 869895029712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 217920598899 and 217920598908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4540012455 + ... + 4540012502.

Almost surely, 2^217920598968 is an apocalyptic number.

It is an amenable number.

217920598968 is an abundant number, since it is smaller than the sum of its proper divisors (326880898512).

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

217920598968 is a wasteful number, since it uses less digits than its factorization.

217920598968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9080024966 (or 9080024962 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 66.

The spelling of 217920598968 in words is "two hundred seventeen billion, nine hundred twenty million, five hundred ninety-eight thousand, nine hundred sixty-eight".