216690567 has 12 divisors (see below), whose sum is σ = 302030904. Its totient is φ = 138178480.

The previous prime is 216690541. The next prime is 216690577. The reversal of 216690567 is 765096612.

It is not a de Polignac number, because 216690567 - 2⁸ = 216690311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216690577) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 66684 + ... + 69857.

It is an arithmetic number, because the mean of its divisors is an integer number (25169242).

Almost surely, 2^216690567 is an apocalyptic number.

216690567 is a deficient number, since it is larger than the sum of its proper divisors (85340337).

216690567 is a wasteful number, since it uses less digits than its factorization.

216690567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136590 (or 136567 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 216690567 is about 14720.4132754485. The cubic root of 216690567 is about 600.6387336797.

The spelling of 216690567 in words is "two hundred sixteen million, six hundred ninety thousand, five hundred sixty-seven".