217853086311 has 24 divisors (see below), whose sum is σ = 359789225120. Its totient is φ = 124432531776.

The previous prime is 217853086301. The next prime is 217853086369. The reversal of 217853086311 is 113680358712.

It is a happy number.

217853086311 is a `hidden beast` number, since 2 + 1 + 7 + 8 + 5 + 3 + 0 + 8 + 631 + 1 = 666.

217853086311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217853086311 - 2⁷ = 217853086183 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217853086301) 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 23 ways as a sum of consecutive naturals, for example, 619060 + ... + 904953.

Almost surely, 2^217853086311 is an apocalyptic number.

217853086311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

217853086311 is a deficient number, since it is larger than the sum of its proper divisors (141936138809).

217853086311 is a wasteful number, since it uses less digits than its factorization.

217853086311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526295 (or 1526292 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 217853086311 in words is "two hundred seventeen billion, eight hundred fifty-three million, eighty-six thousand, three hundred eleven".