216601667 has 8 divisors (see below), whose sum is σ = 227745840. Its totient is φ = 205702560.

The previous prime is 216601661. The next prime is 216601669. The reversal of 216601667 is 766106612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216601667 - 2²⁴ = 199824451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216601661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59453 + ... + 62990.

It is an arithmetic number, because the mean of its divisors is an integer number (28468230).

Almost surely, 2^216601667 is an apocalyptic number.

216601667 is a deficient number, since it is larger than the sum of its proper divisors (11144173).

216601667 is a wasteful number, since it uses less digits than its factorization.

216601667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122533.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 216601667 is about 14717.3933493673. The cubic root of 216601667 is about 600.5565826074.

The spelling of 216601667 in words is "two hundred sixteen million, six hundred one thousand, six hundred sixty-seven".