216658642 has 8 divisors (see below), whose sum is σ = 344104956. Its totient is φ = 101956992.

The previous prime is 216658633. The next prime is 216658661. The reversal of 216658642 is 246856612.

It can be written as a sum of positive squares in 2 ways, for example, as 209641441 + 7017201 = 14479^2 + 2649^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 216658595 and 216658604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3186123 + ... + 3186190.

Almost surely, 2^216658642 is an apocalyptic number.

216658642 is a deficient number, since it is larger than the sum of its proper divisors (127446314).

216658642 is a wasteful number, since it uses less digits than its factorization.

216658642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6372332.

The product of its digits is 138240, while the sum is 40.

The square root of 216658642 is about 14719.3288569826. The cubic root of 216658642 is about 600.6092348824.

The spelling of 216658642 in words is "two hundred sixteen million, six hundred fifty-eight thousand, six hundred forty-two".