201688217243 has 32 divisors (see below), whose sum is σ = 220329849600. Its totient is φ = 183918007296.

The previous prime is 201688217231. The next prime is 201688217281. The reversal of 201688217243 is 342712886102.

It is a cyclic number.

It is not a de Polignac number, because 201688217243 - 2¹⁸ = 201687955099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201688217194 and 201688217203.

It is not an unprimeable number, because it can be changed into a prime (201688217293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18432068 + ... + 18443006.

It is an arithmetic number, because the mean of its divisors is an integer number (6885307800).

Almost surely, 2^201688217243 is an apocalyptic number.

201688217243 is a deficient number, since it is larger than the sum of its proper divisors (18641632357).

201688217243 is a wasteful number, since it uses less digits than its factorization.

201688217243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 201688217243 in words is "two hundred one billion, six hundred eighty-eight million, two hundred seventeen thousand, two hundred forty-three".