17664420623 has 4 divisors (see below), whose sum is σ = 17928068760. Its totient is φ = 17400772488.

The previous prime is 17664420617. The next prime is 17664420661. The reversal of 17664420623 is 32602446671.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32602446671 = 29 ⋅1124222299.

It is a cyclic number.

It is not a de Polignac number, because 17664420623 - 2⁶ = 17664420559 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 (17664420223) 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, 131823968 + ... + 131824101.

It is an arithmetic number, because the mean of its divisors is an integer number (4482017190).

Almost surely, 2^17664420623 is an apocalyptic number.

17664420623 is a deficient number, since it is larger than the sum of its proper divisors (263648137).

17664420623 is an equidigital number, since it uses as much as digits as its factorization.

17664420623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263648136.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 17664420623 in words is "seventeen billion, six hundred sixty-four million, four hundred twenty thousand, six hundred twenty-three".