9856703494521 has 24 divisors (see below), whose sum is σ = 16234570464840. Its totient is φ = 5708859941376.

The previous prime is 9856703494511. The next prime is 9856703494591. The reversal of 9856703494521 is 1254943076589.

9856703494521 is a `hidden beast` number, since 9 + 8 + 5 + 6 + 70 + 34 + 9 + 4 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3816728786025 + 6039974708496 = 1953645^2 + 2457636^2 .

It is not a de Polignac number, because 9856703494521 - 2⁶ = 9856703494457 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9856703494501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2477801806 + ... + 2477805783.

It is an arithmetic number, because the mean of its divisors is an integer number (676440436035).

It is a 1-persistent number, because it is pandigital, but 2⋅9856703494521 = 19713406989042 is not.

Almost surely, 2^{9856703494521} is an apocalyptic number.

It is an amenable number.

9856703494521 is a deficient number, since it is larger than the sum of its proper divisors (6377866970319).

9856703494521 is a wasteful number, since it uses less digits than its factorization.

9856703494521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955607625 (or 4955607622 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 9856703494521 in words is "nine trillion, eight hundred fifty-six billion, seven hundred three million, four hundred ninety-four thousand, five hundred twenty-one".