16555620477225 has 24 divisors (see below), whose sum is σ = 27424295696032. Its totient is φ = 8812781510400.

The previous prime is 16555620477203. The next prime is 16555620477251. The reversal of 16555620477225 is 52277402655561.

16555620477225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16555620477225 - 2¹⁰ = 16555620476201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210994816 + ... + 211073265.

Almost surely, 2^{16555620477225} is an apocalyptic number.

16555620477225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16555620477225 is a deficient number, since it is larger than the sum of its proper divisors (10868675218807).

16555620477225 is a wasteful number, since it uses less digits than its factorization.

16555620477225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422068617 (or 422068612 counting only the distinct ones).

The product of its (nonzero) digits is 35280000, while the sum is 57.

The spelling of 16555620477225 in words is "sixteen trillion, five hundred fifty-five billion, six hundred twenty million, four hundred seventy-seven thousand, two hundred twenty-five".