215056642564 has 9 divisors (see below), whose sum is σ = 376350747591.
Its totient is φ = 107527857540.
The previous prime is 215056642487. The next prime is 215056642571. The reversal of 215056642564 is 465246650512.
The square root of 215056642564 is 463742.
It is a perfect power (a square), and thus also a powerful number.
It is a Duffinian number.
It is an unprimeable number.
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 2 ways as a sum of consecutive naturals, for example, 811549 + ... + 1043419.
Almost surely, 2215056642564 is an apocalyptic number.
215056642564 is the 463742-nd square number.
It is an amenable number.
215056642564 is a deficient number, since it is larger than the sum of its proper divisors (161294105027).
215056642564 is an frugal number, since it uses more digits than its factorization.
215056642564 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 463746 (or 231873 counting only the distinct ones).
The product of its (nonzero) digits is 1728000, while the sum is 46.
The spelling of 215056642564 in words is "two hundred fifteen billion, fifty-six million, six hundred forty-two thousand, five hundred sixty-four".