9796780018 has 32 divisors (see below), whose sum is σ = 15211477296. Its totient is φ = 4729540608.

The previous prime is 9796780013. The next prime is 9796780031. The reversal of 9796780018 is 8100876979.

It can be written as a sum of positive squares in 8 ways, for example, as 6158639529 + 3638140489 = 78477^2 + 60317^2 .

It is not an unprimeable number, because it can be changed into a prime (9796780013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4308930 + ... + 4311202.

Almost surely, 2^9796780018 is an apocalyptic number.

9796780018 is a deficient number, since it is larger than the sum of its proper divisors (5414697278).

9796780018 is a wasteful number, since it uses less digits than its factorization.

9796780018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 9796780018 is about 98978.6846649318. The cubic root of 9796780018 is about 2139.7405585559.

The spelling of 9796780018 in words is "nine billion, seven hundred ninety-six million, seven hundred eighty thousand, eighteen".