17964645497 has 4 divisors (see below), whose sum is σ = 17965008996. Its totient is φ = 17964282000.

The previous prime is 17964645493. The next prime is 17964645499. The reversal of 17964645497 is 79454646971.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14848884736 + 3115760761 = 121856^2 + 55819^2 .

It is a cyclic number.

It is not a de Polignac number, because 17964645497 - 2² = 17964645493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17964645493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93254 + ... + 211247.

It is an arithmetic number, because the mean of its divisors is an integer number (4491252249).

Almost surely, 2^17964645497 is an apocalyptic number.

It is an amenable number.

17964645497 is a deficient number, since it is larger than the sum of its proper divisors (363499).

17964645497 is an equidigital number, since it uses as much as digits as its factorization.

17964645497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363498.

The product of its digits is 45722880, while the sum is 62.

The spelling of 17964645497 in words is "seventeen billion, nine hundred sixty-four million, six hundred forty-five thousand, four hundred ninety-seven".