684447533808381 has 12 divisors (see below), whose sum is σ = 1129881643112352. Its totient is φ = 391112876461896.

The previous prime is 684447533808347. The next prime is 684447533808383. The reversal of 684447533808381 is 183808335744486.

684447533808381 is a `hidden beast` number, since 6 + 8 + 4 + 4 + 4 + 7 + 533 + 8 + 0 + 8 + 3 + 81 = 666.

It is not a de Polignac number, because 684447533808381 - 2¹³ = 684447533800189 is a prime.

It is a super-2 number, since 2×684447533808381² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684447533808383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5432123284131 + ... + 5432123284256.

It is an arithmetic number, because the mean of its divisors is an integer number (94156803592696).

Almost surely, 2^{684447533808381} is an apocalyptic number.

It is an amenable number.

684447533808381 is a deficient number, since it is larger than the sum of its proper divisors (445434109303971).

684447533808381 is a wasteful number, since it uses less digits than its factorization.

684447533808381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10864246568400 (or 10864246568397 counting only the distinct ones).

The product of its (nonzero) digits is 1486356480, while the sum is 72.

The spelling of 684447533808381 in words is "six hundred eighty-four trillion, four hundred forty-seven billion, five hundred thirty-three million, eight hundred eight thousand, three hundred eighty-one".