216720671515 has 16 divisors (see below), whose sum is σ = 275400227232. Its totient is φ = 163155700224.

The previous prime is 216720671513. The next prime is 216720671521. The reversal of 216720671515 is 515176027612.

216720671515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 216720671515 - 2¹ = 216720671513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216720671513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 468277 + ... + 807913.

It is an arithmetic number, because the mean of its divisors is an integer number (17212514202).

Almost surely, 2^216720671515 is an apocalyptic number.

216720671515 is a deficient number, since it is larger than the sum of its proper divisors (58679555717).

216720671515 is a wasteful number, since it uses less digits than its factorization.

216720671515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347166.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 216720671515 in words is "two hundred sixteen billion, seven hundred twenty million, six hundred seventy-one thousand, five hundred fifteen".