17995997859 has 16 divisors (see below), whose sum is σ = 27424458240. Its totient is φ = 10282682880.

The previous prime is 17995997849. The next prime is 17995997863. The reversal of 17995997859 is 95879959971.

It is not a de Polignac number, because 17995997859 - 2¹⁹ = 17995473571 is a prime.

It is a super-2 number, since 2×17995997859² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17995997809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415299 + ... + 456579.

It is an arithmetic number, because the mean of its divisors is an integer number (1714028640).

Almost surely, 2^17995997859 is an apocalyptic number.

17995997859 is a deficient number, since it is larger than the sum of its proper divisors (9428460381).

17995997859 is a wasteful number, since it uses less digits than its factorization.

17995997859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62050.

The product of its digits is 578680200, while the sum is 78.

The spelling of 17995997859 in words is "seventeen billion, nine hundred ninety-five million, nine hundred ninety-seven thousand, eight hundred fifty-nine".