16423643693 has 2 divisors, whose sum is σ = 16423643694. Its totient is φ = 16423643692.

The previous prime is 16423643651. The next prime is 16423643701. The reversal of 16423643693 is 39634632461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16093967044 + 329676649 = 126862^2 + 18157^2 .

It is a cyclic number.

It is not a de Polignac number, because 16423643693 - 2⁶ = 16423643629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16423643623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211821846 + 8211821847.

It is an arithmetic number, because the mean of its divisors is an integer number (8211821847).

Almost surely, 2^16423643693 is an apocalyptic number.

It is an amenable number.

16423643693 is a deficient number, since it is larger than the sum of its proper divisors (1).

16423643693 is an equidigital number, since it uses as much as digits as its factorization.

16423643693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 47.

The spelling of 16423643693 in words is "sixteen billion, four hundred twenty-three million, six hundred forty-three thousand, six hundred ninety-three".