667216216785 has 32 divisors (see below), whose sum is σ = 1070536642560. Its totient is φ = 354852109568.

The previous prime is 667216216763. The next prime is 667216216811. The reversal of 667216216785 is 587612612766.

667216216785 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 667216216785 - 2¹⁰ = 667216215761 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49796707 + ... + 49810103.

It is an arithmetic number, because the mean of its divisors is an integer number (33454270080).

Almost surely, 2^667216216785 is an apocalyptic number.

It is an amenable number.

667216216785 is a deficient number, since it is larger than the sum of its proper divisors (403320425775).

667216216785 is a wasteful number, since it uses less digits than its factorization.

667216216785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22457.

The product of its digits is 10160640, while the sum is 57.

The spelling of 667216216785 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred sixteen thousand, seven hundred eighty-five".