16506499447 has 4 divisors (see below), whose sum is σ = 17224173360. Its totient is φ = 15788825536.

The previous prime is 16506499441. The next prime is 16506499453. The reversal of 16506499447 is 74499460561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74499460561 = 151 ⋅493373911.

It is an interprime number because it is at equal distance from previous prime (16506499441) and next prime (16506499453).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16506499447 is a prime.

It is a super-2 number, since 2×16506499447² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506499441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358836922 + ... + 358836967.

It is an arithmetic number, because the mean of its divisors is an integer number (4306043340).

Almost surely, 2^16506499447 is an apocalyptic number.

16506499447 is a deficient number, since it is larger than the sum of its proper divisors (717673913).

16506499447 is an equidigital number, since it uses as much as digits as its factorization.

16506499447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717673912.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 16506499447 in words is "sixteen billion, five hundred six million, four hundred ninety-nine thousand, four hundred forty-seven".