16433424661 has 4 divisors (see below), whose sum is σ = 16502184000. Its totient is φ = 16364665324.

The previous prime is 16433424659. The next prime is 16433424713. The reversal of 16433424661 is 16642433461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16642433461 = 4243 ⋅3922327.

It is a cyclic number.

It is not a de Polignac number, because 16433424661 - 2¹ = 16433424659 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 (16433424961) 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, 34379311 + ... + 34379788.

It is an arithmetic number, because the mean of its divisors is an integer number (4125546000).

Almost surely, 2^16433424661 is an apocalyptic number.

It is an amenable number.

16433424661 is a deficient number, since it is larger than the sum of its proper divisors (68759339).

16433424661 is an equidigital number, since it uses as much as digits as its factorization.

16433424661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68759338.

The product of its digits is 248832, while the sum is 40.

The spelling of 16433424661 in words is "sixteen billion, four hundred thirty-three million, four hundred twenty-four thousand, six hundred sixty-one".