16545766656553 has 4 divisors (see below), whose sum is σ = 16772420994388. Its totient is φ = 16319112318720.

The previous prime is 16545766656521. The next prime is 16545766656599. The reversal of 16545766656553 is 35565666754561.

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 11400799521049 + 5144967135504 = 3376507^2 + 2268252^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545766656553 - 2⁵ = 16545766656521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16545766696553) 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, 113327168808 + ... + 113327168953.

It is an arithmetic number, because the mean of its divisors is an integer number (4193105248597).

Almost surely, 2^{16545766656553} is an apocalyptic number.

It is an amenable number.

16545766656553 is a deficient number, since it is larger than the sum of its proper divisors (226654337835).

16545766656553 is an equidigital number, since it uses as much as digits as its factorization.

16545766656553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226654337834.

The product of its digits is 2041200000, while the sum is 70.

The spelling of 16545766656553 in words is "sixteen trillion, five hundred forty-five billion, seven hundred sixty-six million, six hundred fifty-six thousand, five hundred fifty-three".