17998660367 has 4 divisors (see below), whose sum is σ = 18000066480. Its totient is φ = 17997254256.

The previous prime is 17998660363. The next prime is 17998660399. The reversal of 17998660367 is 76306689971.

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

It is a cyclic number.

It is not a de Polignac number, because 17998660367 - 2² = 17998660363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17998660363) 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, 683678 + ... + 709515.

It is an arithmetic number, because the mean of its divisors is an integer number (4500016620).

Almost surely, 2^17998660367 is an apocalyptic number.

17998660367 is a deficient number, since it is larger than the sum of its proper divisors (1406113).

17998660367 is a wasteful number, since it uses less digits than its factorization.

17998660367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406112.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 17998660367 in words is "seventeen billion, nine hundred ninety-eight million, six hundred sixty thousand, three hundred sixty-seven".