217906629650 has 24 divisors (see below), whose sum is σ = 405396480420. Its totient is φ = 87143264960.

The previous prime is 217906629631. The next prime is 217906629659. The reversal of 217906629650 is 56926609712.

217906629650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 2399922121 + 215506707529 = 48989^2 + 464227^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217906629592 and 217906629601.

It is not an unprimeable number, because it can be changed into a prime (217906629659) 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 11 ways as a sum of consecutive naturals, for example, 256565 + ... + 708264.

Almost surely, 2^217906629650 is an apocalyptic number.

217906629650 is a deficient number, since it is larger than the sum of its proper divisors (187489850770).

217906629650 is a wasteful number, since it uses less digits than its factorization.

217906629650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969358 (or 969353 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 217906629650 in words is "two hundred seventeen billion, nine hundred six million, six hundred twenty-nine thousand, six hundred fifty".