16556801561673 has 16 divisors (see below), whose sum is σ = 22405415893056. Its totient is φ = 10873030291200.

The previous prime is 16556801561647. The next prime is 16556801561687. The reversal of 16556801561673 is 37616510865561.

16556801561673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-16556801561673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16556801511673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29403373 + ... + 29961173.

It is an arithmetic number, because the mean of its divisors is an integer number (1400338493316).

Almost surely, 2^{16556801561673} is an apocalyptic number.

It is an amenable number.

16556801561673 is a deficient number, since it is larger than the sum of its proper divisors (5848614331383).

16556801561673 is a wasteful number, since it uses less digits than its factorization.

16556801561673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705544.

The product of its (nonzero) digits is 27216000, while the sum is 60.

The spelling of 16556801561673 in words is "sixteen trillion, five hundred fifty-six billion, eight hundred one million, five hundred sixty-one thousand, six hundred seventy-three".