216641953 has 8 divisors (see below), whose sum is σ = 236725920. Its totient is φ = 196622880.

The previous prime is 216641951. The next prime is 216641963. The reversal of 216641953 is 359146612.

216641953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216641953 - 2¹ = 216641951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216641951) 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, 9100 + ... + 22717.

It is an arithmetic number, because the mean of its divisors is an integer number (29590740).

Almost surely, 2^216641953 is an apocalyptic number.

It is an amenable number.

216641953 is a deficient number, since it is larger than the sum of its proper divisors (20083967).

216641953 is a wasteful number, since it uses less digits than its factorization.

216641953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32447.

The product of its digits is 38880, while the sum is 37.

The square root of 216641953 is about 14718.7619384240. The cubic root of 216641953 is about 600.5938130422.

The spelling of 216641953 in words is "two hundred sixteen million, six hundred forty-one thousand, nine hundred fifty-three".