16553720843 has 4 divisors (see below), whose sum is σ = 18058604568. Its totient is φ = 15048837120.

The previous prime is 16553720741. The next prime is 16553720851. The reversal of 16553720843 is 34802735561.

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

It is a cyclic number.

It is not a de Polignac number, because 16553720843 - 2¹⁸ = 16553458699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16553720794 and 16553720803.

It is not an unprimeable number, because it can be changed into a prime (16553720143) 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, 752441846 + ... + 752441867.

It is an arithmetic number, because the mean of its divisors is an integer number (4514651142).

Almost surely, 2^16553720843 is an apocalyptic number.

16553720843 is a deficient number, since it is larger than the sum of its proper divisors (1504883725).

16553720843 is a wasteful number, since it uses less digits than its factorization.

16553720843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504883724.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 16553720843 in words is "sixteen billion, five hundred fifty-three million, seven hundred twenty thousand, eight hundred forty-three".