16506423653 has 2 divisors, whose sum is σ = 16506423654. Its totient is φ = 16506423652.

The previous prime is 16506423617. The next prime is 16506423701. The reversal of 16506423653 is 35632460561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13211893249 + 3294530404 = 114943^2 + 57398^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506423653 - 2⁶ = 16506423589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16506423653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506423613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253211826 + 8253211827.

It is an arithmetic number, because the mean of its divisors is an integer number (8253211827).

Almost surely, 2^16506423653 is an apocalyptic number.

It is an amenable number.

16506423653 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506423653 is an equidigital number, since it uses as much as digits as its factorization.

16506423653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 16506423653 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, six hundred fifty-three".