17958975049 has 4 divisors (see below), whose sum is σ = 19015385364. Its totient is φ = 16902564736.

The previous prime is 17958975037. The next prime is 17958975071. The reversal of 17958975049 is 94057985971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94057985971 = 67523 ⋅1392977.

It can be written as a sum of positive squares in 2 ways, for example, as 6130890000 + 11828085049 = 78300^2 + 108757^2 .

It is a cyclic number.

It is not a de Polignac number, because 17958975049 - 2⁷ = 17958974921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17958915049) 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, 528205132 + ... + 528205165.

It is an arithmetic number, because the mean of its divisors is an integer number (4753846341).

Almost surely, 2^17958975049 is an apocalyptic number.

It is an amenable number.

17958975049 is a deficient number, since it is larger than the sum of its proper divisors (1056410315).

17958975049 is a wasteful number, since it uses less digits than its factorization.

17958975049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056410314.

The product of its (nonzero) digits is 28576800, while the sum is 64.

The spelling of 17958975049 in words is "seventeen billion, nine hundred fifty-eight million, nine hundred seventy-five thousand, forty-nine".