9945665499 has 32 divisors (see below), whose sum is σ = 17505593856. Its totient is φ = 4862661120.

The previous prime is 9945665491. The next prime is 9945665519.

It is a happy number.

9945665499 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9945665499 - 2³ = 9945665491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9945665491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1262392 + ... + 1270245.

It is an arithmetic number, because the mean of its divisors is an integer number (547049808).

Almost surely, 2^9945665499 is an apocalyptic number.

9945665499 is a deficient number, since it is larger than the sum of its proper divisors (7559928357).

9945665499 is a wasteful number, since it uses less digits than its factorization.

9945665499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532675.

The product of its digits is 94478400, while the sum is 66.

The square root of 9945665499 is about 99727.9574592802. The cubic root of 9945665499 is about 2150.5255970454.

The spelling of 9945665499 in words is "nine billion, nine hundred forty-five million, six hundred sixty-five thousand, four hundred ninety-nine".