216638697 has 8 divisors (see below), whose sum is σ = 315110880. Its totient is φ = 131296160.

The previous prime is 216638683. The next prime is 216638707. The reversal of 216638697 is 796836612.

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 216638697 - 2¹⁵ = 216605929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216638657) 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, 3282372 + ... + 3282437.

It is an arithmetic number, because the mean of its divisors is an integer number (39388860).

Almost surely, 2^216638697 is an apocalyptic number.

It is an amenable number.

216638697 is a deficient number, since it is larger than the sum of its proper divisors (98472183).

216638697 is a wasteful number, since it uses less digits than its factorization.

216638697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564823.

The product of its digits is 653184, while the sum is 48.

The square root of 216638697 is about 14718.6513308795. The cubic root of 216638697 is about 600.5908041709.

The spelling of 216638697 in words is "two hundred sixteen million, six hundred thirty-eight thousand, six hundred ninety-seven".