17994695321 has 2 divisors, whose sum is σ = 17994695322. Its totient is φ = 17994695320.

The previous prime is 17994695297. The next prime is 17994695353. The reversal of 17994695321 is 12359649971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17881038400 + 113656921 = 133720^2 + 10661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17994695321 is a prime.

It is not a weakly prime, because it can be changed into another prime (17994697321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8997347660 + 8997347661.

It is an arithmetic number, because the mean of its divisors is an integer number (8997347661).

Almost surely, 2^17994695321 is an apocalyptic number.

It is an amenable number.

17994695321 is a deficient number, since it is larger than the sum of its proper divisors (1).

17994695321 is an equidigital number, since it uses as much as digits as its factorization.

17994695321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The spelling of 17994695321 in words is "seventeen billion, nine hundred ninety-four million, six hundred ninety-five thousand, three hundred twenty-one".