17995859972 has 12 divisors (see below), whose sum is σ = 32508650496. Its totient is φ = 8707674120.

The previous prime is 17995859969. The next prime is 17995859993. The reversal of 17995859972 is 27995859971.

It is a super-2 number, since 2×17995859972² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17995859896 and 17995859905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72563828 + ... + 72564075.

It is an arithmetic number, because the mean of its divisors is an integer number (2709054208).

Almost surely, 2^17995859972 is an apocalyptic number.

It is an amenable number.

17995859972 is a deficient number, since it is larger than the sum of its proper divisors (14512790524).

17995859972 is a wasteful number, since it uses less digits than its factorization.

17995859972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145127938 (or 145127936 counting only the distinct ones).

The product of its digits is 128595600, while the sum is 71.

Subtracting 17995859972 from its reverse (27995859971), we obtain a palindrome (9999999999).

The spelling of 17995859972 in words is "seventeen billion, nine hundred ninety-five million, eight hundred fifty-nine thousand, nine hundred seventy-two".