8217340642356 has 12 divisors (see below), whose sum is σ = 19173794832192. Its totient is φ = 2739113547448.

The previous prime is 8217340642349. The next prime is 8217340642397. The reversal of 8217340642356 is 6532460437128.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-4 number, since 4×8217340642356⁴ (a number of 53 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8217340642299 and 8217340642308.

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, 342389193420 + ... + 342389193443.

It is an arithmetic number, because the mean of its divisors is an integer number (1597816236016).

Almost surely, 2^{8217340642356} is an apocalyptic number.

It is an amenable number.

8217340642356 is an abundant number, since it is smaller than the sum of its proper divisors (10956454189836).

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

8217340642356 is a wasteful number, since it uses less digits than its factorization.

8217340642356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684778386870 (or 684778386868 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 8217340642356 in words is "eight trillion, two hundred seventeen billion, three hundred forty million, six hundred forty-two thousand, three hundred fifty-six".