216601642 has 8 divisors (see below), whose sum is σ = 326251332. Its totient is φ = 107851200.

The previous prime is 216601613. The next prime is 216601657. The reversal of 216601642 is 246106612.

It can be written as a sum of positive squares in 2 ways, for example, as 215825481 + 776161 = 14691^2 + 881^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 216601642.

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, 224209 + ... + 225172.

Almost surely, 2^216601642 is an apocalyptic number.

216601642 is a deficient number, since it is larger than the sum of its proper divisors (109649690).

216601642 is a wasteful number, since it uses less digits than its factorization.

216601642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449624.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 216601642 is about 14717.3925000321. The cubic root of 216601642 is about 600.5565595022.

The spelling of 216601642 in words is "two hundred sixteen million, six hundred one thousand, six hundred forty-two".