17997017807 has 4 divisors (see below), whose sum is σ = 17998203120. Its totient is φ = 17995832496.

The previous prime is 17997017803. The next prime is 17997017813. The reversal of 17997017807 is 70871079971.

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 17997017807 - 2² = 17997017803 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 (17997017803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569582 + ... + 600347.

It is an arithmetic number, because the mean of its divisors is an integer number (4499550780).

Almost surely, 2^17997017807 is an apocalyptic number.

17997017807 is a deficient number, since it is larger than the sum of its proper divisors (1185313).

17997017807 is a wasteful number, since it uses less digits than its factorization.

17997017807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185312.

The product of its (nonzero) digits is 1555848, while the sum is 56.

The spelling of 17997017807 in words is "seventeen billion, nine hundred ninety-seven million, seventeen thousand, eight hundred seven".