16818082553 has 4 divisors (see below), whose sum is σ = 16818629760. Its totient is φ = 16817535348.

The previous prime is 16818082543. The next prime is 16818082577. The reversal of 16818082553 is 35528081861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35528081861 = 59 ⋅602170879.

It is a cyclic number.

It is not a de Polignac number, because 16818082553 - 2²² = 16813888249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16818082498 and 16818082507.

It is not an unprimeable number, because it can be changed into a prime (16818082543) 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, 224573 + ... + 289946.

It is an arithmetic number, because the mean of its divisors is an integer number (4204657440).

Almost surely, 2^16818082553 is an apocalyptic number.

It is an amenable number.

16818082553 is a deficient number, since it is larger than the sum of its proper divisors (547207).

16818082553 is an equidigital number, since it uses as much as digits as its factorization.

16818082553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547206.

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 16818082553 in words is "sixteen billion, eight hundred eighteen million, eighty-two thousand, five hundred fifty-three".