16506423539 has 2 divisors, whose sum is σ = 16506423540. Its totient is φ = 16506423538.

The previous prime is 16506423529. The next prime is 16506423541. The reversal of 16506423539 is 93532460561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16506423539 is a prime.

Together with 16506423541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16506423539.

It is not a weakly prime, because it can be changed into another prime (16506423529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253211769 + 8253211770.

It is an arithmetic number, because the mean of its divisors is an integer number (8253211770).

Almost surely, 2^16506423539 is an apocalyptic number.

16506423539 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506423539 is an equidigital number, since it uses as much as digits as its factorization.

16506423539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 44.

The spelling of 16506423539 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, five hundred thirty-nine".