16506423493 has 16 divisors (see below), whose sum is σ = 19520208000. Its totient is φ = 13656831552.

The previous prime is 16506423487. The next prime is 16506423497. The reversal of 16506423493 is 39432460561.

It is not a de Polignac number, because 16506423493 - 2⁹ = 16506422981 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 (16506423497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963678 + ... + 980656.

It is an arithmetic number, because the mean of its divisors is an integer number (1220013000).

Almost surely, 2^16506423493 is an apocalyptic number.

It is an amenable number.

16506423493 is a deficient number, since it is larger than the sum of its proper divisors (3013784507).

16506423493 is a wasteful number, since it uses less digits than its factorization.

16506423493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21804.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 16506423493 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, four hundred ninety-three".