9849403688681 has 2 divisors, whose sum is σ = 9849403688682. Its totient is φ = 9849403688680.

The previous prime is 9849403688603. The next prime is 9849403688687. The reversal of 9849403688681 is 1868863049489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9334369248400 + 515034440281 = 3055220^2 + 717659^2 .

It is a cyclic number.

It is not a de Polignac number, because 9849403688681 - 2¹⁰ = 9849403687657 is a prime.

It is a super-2 number, since 2×9849403688681² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9849403688599 and 9849403688608.

It is not a weakly prime, because it can be changed into another prime (9849403688687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4924701844340 + 4924701844341.

It is an arithmetic number, because the mean of its divisors is an integer number (4924701844341).

Almost surely, 2^{9849403688681} is an apocalyptic number.

It is an amenable number.

9849403688681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9849403688681 is an equidigital number, since it uses as much as digits as its factorization.

9849403688681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 573308928, while the sum is 74.

The spelling of 9849403688681 in words is "nine trillion, eight hundred forty-nine billion, four hundred three million, six hundred eighty-eight thousand, six hundred eighty-one".