216232661 has 8 divisors (see below), whose sum is σ = 218230848. Its totient is φ = 214240000.

The previous prime is 216232649. The next prime is 216232663. The reversal of 216232661 is 166232612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216232661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216232663) 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, 134261 + ... + 135861.

It is an arithmetic number, because the mean of its divisors is an integer number (27278856).

Almost surely, 2^216232661 is an apocalyptic number.

It is an amenable number.

216232661 is a deficient number, since it is larger than the sum of its proper divisors (1998187).

216232661 is a wasteful number, since it uses less digits than its factorization.

216232661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763.

The product of its digits is 5184, while the sum is 29.

The square root of 216232661 is about 14704.8516143482. The cubic root of 216232661 is about 600.2153495502.

The spelling of 216232661 in words is "two hundred sixteen million, two hundred thirty-two thousand, six hundred sixty-one".