216352657 has 4 divisors (see below), whose sum is σ = 218004336. Its totient is φ = 214700980.

The previous prime is 216352637. The next prime is 216352663. The reversal of 216352657 is 756253612.

216352657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216352657 - 2¹¹ = 216350609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216352607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825643 + ... + 825904.

It is an arithmetic number, because the mean of its divisors is an integer number (54501084).

Almost surely, 2^216352657 is an apocalyptic number.

It is an amenable number.

216352657 is a deficient number, since it is larger than the sum of its proper divisors (1651679).

216352657 is a wasteful number, since it uses less digits than its factorization.

216352657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651678.

The product of its digits is 75600, while the sum is 37.

The square root of 216352657 is about 14708.9311984250. The cubic root of 216352657 is about 600.3263567126.

The spelling of 216352657 in words is "two hundred sixteen million, three hundred fifty-two thousand, six hundred fifty-seven".