16505211005 has 16 divisors (see below), whose sum is σ = 20983560624. Its totient is φ = 12420203520.

The previous prime is 16505210993. The next prime is 16505211017. The reversal of 16505211005 is 50011250561.

It is an interprime number because it is at equal distance from previous prime (16505210993) and next prime (16505211017).

It can be written as a sum of positive squares in 8 ways, for example, as 5533276996 + 10971934009 = 74386^2 + 104747^2 .

It is not a de Polignac number, because 16505211005 - 2⁴ = 16505210989 is a prime.

It is a super-2 number, since 2×16505211005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92219 + ... + 203751.

It is an arithmetic number, because the mean of its divisors is an integer number (1311472539).

Almost surely, 2^16505211005 is an apocalyptic number.

It is an amenable number.

16505211005 is a deficient number, since it is larger than the sum of its proper divisors (4478349619).

16505211005 is a wasteful number, since it uses less digits than its factorization.

16505211005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113296.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 16505211005 its reverse (50011250561), we get a palindrome (66516461566).

The spelling of 16505211005 in words is "sixteen billion, five hundred five million, two hundred eleven thousand, five".