217689759342 has 48 divisors (see below), whose sum is σ = 523260466560. Its totient is φ = 64848512400.

The previous prime is 217689759341. The next prime is 217689759377. The reversal of 217689759342 is 243957986712.

217689759342 is a `hidden beast` number, since 217 + 6 + 8 + 9 + 75 + 9 + 342 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 217689759342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217689759341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9305634 + ... + 9328997.

It is an arithmetic number, because the mean of its divisors is an integer number (10901259720).

Almost surely, 2^217689759342 is an apocalyptic number.

217689759342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

217689759342 is an abundant number, since it is smaller than the sum of its proper divisors (305570707218).

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

217689759342 is a wasteful number, since it uses less digits than its factorization.

217689759342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18634709 (or 18634706 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 217689759342 in words is "two hundred seventeen billion, six hundred eighty-nine million, seven hundred fifty-nine thousand, three hundred forty-two".