17999798017679 has 4 divisors (see below), whose sum is σ = 17999996897784. Its totient is φ = 17999599137576.

The previous prime is 17999798017673. The next prime is 17999798017681. The reversal of 17999798017679 is 97671089799971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17999798017679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17999798017594 and 17999798017603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17999798017673) 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, 99304232 + ... + 99485325.

It is an arithmetic number, because the mean of its divisors is an integer number (4499999224446).

Almost surely, 2^{17999798017679} is an apocalyptic number.

17999798017679 is a deficient number, since it is larger than the sum of its proper divisors (198880105).

17999798017679 is an equidigital number, since it uses as much as digits as its factorization.

17999798017679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198880104.

The product of its (nonzero) digits is 6805279152, while the sum is 89.

The spelling of 17999798017679 in words is "seventeen trillion, nine hundred ninety-nine billion, seven hundred ninety-eight million, seventeen thousand, six hundred seventy-nine".