16555005553 has 4 divisors (see below), whose sum is σ = 16555794660. Its totient is φ = 16554216448.

The previous prime is 16555005541. The next prime is 16555005563. The reversal of 16555005553 is 35550055561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35550055561 = 86027 ⋅413243.

It can be written as a sum of positive squares in 2 ways, for example, as 2566739569 + 13988265984 = 50663^2 + 118272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16555005553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16555005563) 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, 362200 + ... + 405337.

It is an arithmetic number, because the mean of its divisors is an integer number (4138948665).

Almost surely, 2^16555005553 is an apocalyptic number.

It is an amenable number.

16555005553 is a deficient number, since it is larger than the sum of its proper divisors (789107).

16555005553 is an equidigital number, since it uses as much as digits as its factorization.

16555005553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789106.

The product of its (nonzero) digits is 281250, while the sum is 40.

The spelling of 16555005553 in words is "sixteen billion, five hundred fifty-five million, five thousand, five hundred fifty-three".