16505162563 has 4 divisors (see below), whose sum is σ = 16505419528. Its totient is φ = 16504905600.

The previous prime is 16505162539. The next prime is 16505162567. The reversal of 16505162563 is 36526150561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36526150561 = 41 ⋅890881721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16505162563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16505162567) 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 in 3 ways as a sum of consecutive naturals, for example, 61888 + ... + 191938.

It is an arithmetic number, because the mean of its divisors is an integer number (4126354882).

Almost surely, 2^16505162563 is an apocalyptic number.

16505162563 is a deficient number, since it is larger than the sum of its proper divisors (256965).

16505162563 is a wasteful number, since it uses less digits than its factorization.

16505162563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256964.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 16505162563 in words is "sixteen billion, five hundred five million, one hundred sixty-two thousand, five hundred sixty-three".