16505015550505 has 16 divisors (see below), whose sum is σ = 20342666923344. Its totient is φ = 12846294316800.

The previous prime is 16505015550481. The next prime is 16505015550523. The reversal of 16505015550505 is 50505551050561.

16505015550505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1272754010896 + 15232261539609 = 1128164^2 + 3902853^2 .

It is not a de Polignac number, because 16505015550505 - 2¹¹ = 16505015548457 is a prime.

It is a super-4 number, since 4×16505015550505⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian 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, 160302 + ... + 5747671.

It is an arithmetic number, because the mean of its divisors is an integer number (1271416682709).

Almost surely, 2^{16505015550505} is an apocalyptic number.

It is an amenable number.

16505015550505 is a deficient number, since it is larger than the sum of its proper divisors (3837651372839).

16505015550505 is a wasteful number, since it uses less digits than its factorization.

16505015550505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923116.

The product of its (nonzero) digits is 468750, while the sum is 43.

The spelling of 16505015550505 in words is "sixteen trillion, five hundred five billion, fifteen million, five hundred fifty thousand, five hundred five".