16523053565 has 4 divisors (see below), whose sum is σ = 19827664284. Its totient is φ = 13218442848.

The previous prime is 16523053553. The next prime is 16523053597. The reversal of 16523053565 is 56535032561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3970764196 + 12552289369 = 63014^2 + 112037^2 .

It is a cyclic number.

It is not a de Polignac number, because 16523053565 - 2⁴ = 16523053549 is a prime.

It is a super-2 number, since 2×16523053565² (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 3 ways as a sum of consecutive naturals, for example, 1652305352 + ... + 1652305361.

It is an arithmetic number, because the mean of its divisors is an integer number (4956916071).

Almost surely, 2^16523053565 is an apocalyptic number.

It is an amenable number.

16523053565 is a deficient number, since it is larger than the sum of its proper divisors (3304610719).

16523053565 is an equidigital number, since it uses as much as digits as its factorization.

16523053565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304610718.

The product of its (nonzero) digits is 405000, while the sum is 41.

The spelling of 16523053565 in words is "sixteen billion, five hundred twenty-three million, fifty-three thousand, five hundred sixty-five".