16549677553 has 4 divisors (see below), whose sum is σ = 16901798400. Its totient is φ = 16197556708.

The previous prime is 16549677539. The next prime is 16549677583. The reversal of 16549677553 is 35577694561.

16549677553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 35577694561 = 11863 ⋅2999047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16549677553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16549677523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176060353 + ... + 176060446.

It is an arithmetic number, because the mean of its divisors is an integer number (4225449600).

Almost surely, 2^16549677553 is an apocalyptic number.

It is an amenable number.

16549677553 is a deficient number, since it is larger than the sum of its proper divisors (352120847).

16549677553 is an equidigital number, since it uses as much as digits as its factorization.

16549677553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352120846.

The product of its digits is 23814000, while the sum is 58.

It can be divided in two parts, 165496 and 77553, that added together give a square (243049 = 493²).

The spelling of 16549677553 in words is "sixteen billion, five hundred forty-nine million, six hundred seventy-seven thousand, five hundred fifty-three".