17989412849 has 16 divisors (see below), whose sum is σ = 18962840400. Its totient is φ = 17042006016.

The previous prime is 17989412843. The next prime is 17989412851. The reversal of 17989412849 is 94821498971.

It can be written as a sum of positive squares in 8 ways, for example, as 1811353600 + 16178059249 = 42560^2 + 127193^2 .

It is a cyclic number.

It is not a de Polignac number, because 17989412849 - 2³² = 13694445553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 17989412791 and 17989412800.

It is not an unprimeable number, because it can be changed into a prime (17989412843) 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, 386567 + ... + 430595.

It is an arithmetic number, because the mean of its divisors is an integer number (1185177525).

Almost surely, 2^17989412849 is an apocalyptic number.

It is an amenable number.

17989412849 is a deficient number, since it is larger than the sum of its proper divisors (973427551).

17989412849 is a wasteful number, since it uses less digits than its factorization.

17989412849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44324.

The product of its digits is 10450944, while the sum is 62.

The spelling of 17989412849 in words is "seventeen billion, nine hundred eighty-nine million, four hundred twelve thousand, eight hundred forty-nine".