16506444469 has 2 divisors, whose sum is σ = 16506444470. Its totient is φ = 16506444468.

The previous prime is 16506444463. The next prime is 16506444499. The reversal of 16506444469 is 96444460561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14012640625 + 2493803844 = 118375^2 + 49938^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506444469 - 2⁹ = 16506443957 is a prime.

It is a super-2 number, since 2×16506444469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506444463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253222234 + 8253222235.

It is an arithmetic number, because the mean of its divisors is an integer number (8253222235).

Almost surely, 2^16506444469 is an apocalyptic number.

It is an amenable number.

16506444469 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506444469 is an equidigital number, since it uses as much as digits as its factorization.

16506444469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 16506444469 in words is "sixteen billion, five hundred six million, four hundred forty-four thousand, four hundred sixty-nine".