16505206463 has 4 divisors (see below), whose sum is σ = 17373901560. Its totient is φ = 15636511368.

The previous prime is 16505206411. The next prime is 16505206477. The reversal of 16505206463 is 36460250561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16505206463 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 (16505209463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434347520 + ... + 434347557.

It is an arithmetic number, because the mean of its divisors is an integer number (4343475390).

Almost surely, 2^16505206463 is an apocalyptic number.

16505206463 is a deficient number, since it is larger than the sum of its proper divisors (868695097).

16505206463 is an equidigital number, since it uses as much as digits as its factorization.

16505206463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868695096.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 16505206463 in words is "sixteen billion, five hundred five million, two hundred six thousand, four hundred sixty-three".