9815678497 has 4 divisors (see below), whose sum is σ = 9822307716. Its totient is φ = 9809049280.

The previous prime is 9815678473. The next prime is 9815678519. The reversal of 9815678497 is 7948765189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7948765189 = 821 ⋅9681809.

It can be written as a sum of positive squares in 2 ways, for example, as 2198578321 + 7617100176 = 46889^2 + 87276^2 .

It is a cyclic number.

It is not a de Polignac number, because 9815678497 - 2¹¹ = 9815676449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9815670497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3312388 + ... + 3315349.

It is an arithmetic number, because the mean of its divisors is an integer number (2455576929).

Almost surely, 2^9815678497 is an apocalyptic number.

It is an amenable number.

9815678497 is a deficient number, since it is larger than the sum of its proper divisors (6629219).

9815678497 is a wasteful number, since it uses less digits than its factorization.

9815678497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6629218.

The product of its digits is 30481920, while the sum is 64.

The square root of 9815678497 is about 99074.1060873122. The cubic root of 9815678497 is about 2141.1155636617.

The spelling of 9815678497 in words is "nine billion, eight hundred fifteen million, six hundred seventy-eight thousand, four hundred ninety-seven".