9809320438657 has 4 divisors (see below), whose sum is σ = 9837108882180. Its totient is φ = 9781531995136.

The previous prime is 9809320438549. The next prime is 9809320438667. The reversal of 9809320438657 is 7568340239089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7048302858496 + 2761017580161 = 2654864^2 + 1661631^2 .

It is a cyclic number.

It is not a de Polignac number, because 9809320438657 - 2¹⁵ = 9809320405889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9809320438667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13894221232 + ... + 13894221937.

It is an arithmetic number, because the mean of its divisors is an integer number (2459277220545).

Almost surely, 2^{9809320438657} is an apocalyptic number.

It is an amenable number.

9809320438657 is a deficient number, since it is larger than the sum of its proper divisors (27788443523).

9809320438657 is a wasteful number, since it uses less digits than its factorization.

9809320438657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27788443522.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 9809320438657 in words is "nine trillion, eight hundred nine billion, three hundred twenty million, four hundred thirty-eight thousand, six hundred fifty-seven".