16423643665 has 32 divisors (see below), whose sum is σ = 23228182656. Its totient is φ = 10990287360.

The previous prime is 16423643651. The next prime is 16423643693. The reversal of 16423643665 is 56634632461.

It is not a de Polignac number, because 16423643665 - 2⁹ = 16423643153 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187102 + ... + 260488.

It is an arithmetic number, because the mean of its divisors is an integer number (725880708).

Almost surely, 2^16423643665 is an apocalyptic number.

It is an amenable number.

16423643665 is a deficient number, since it is larger than the sum of its proper divisors (6804538991).

16423643665 is a wasteful number, since it uses less digits than its factorization.

16423643665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73729.

The product of its digits is 1866240, while the sum is 46.

The spelling of 16423643665 in words is "sixteen billion, four hundred twenty-three million, six hundred forty-three thousand, six hundred sixty-five".