17997744909 has 16 divisors (see below), whose sum is σ = 25416797760. Its totient is φ = 11289050880.

The previous prime is 17997744907. The next prime is 17997744967. The reversal of 17997744909 is 90944779971.

It is not a de Polignac number, because 17997744909 - 2¹ = 17997744907 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17997744909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17997744907) 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, 106762 + ... + 217700.

It is an arithmetic number, because the mean of its divisors is an integer number (1588549860).

Almost surely, 2^17997744909 is an apocalyptic number.

It is an amenable number.

17997744909 is a deficient number, since it is larger than the sum of its proper divisors (7419052851).

17997744909 is a wasteful number, since it uses less digits than its factorization.

17997744909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114140.

The product of its (nonzero) digits is 36006768, while the sum is 66.

The spelling of 17997744909 in words is "seventeen billion, nine hundred ninety-seven million, seven hundred forty-four thousand, nine hundred nine".