216156617 has 4 divisors (see below), whose sum is σ = 217451136. Its totient is φ = 214862100.

The previous prime is 216156607. The next prime is 216156623. The reversal of 216156617 is 716651612.

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 216156617 - 2⁸ = 216156361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216156607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647009 + ... + 647342.

It is an arithmetic number, because the mean of its divisors is an integer number (54362784).

Almost surely, 2^216156617 is an apocalyptic number.

It is an amenable number.

216156617 is a deficient number, since it is larger than the sum of its proper divisors (1294519).

216156617 is a wasteful number, since it uses less digits than its factorization.

216156617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294518.

The product of its digits is 15120, while the sum is 35.

The square root of 216156617 is about 14702.2657097469. The cubic root of 216156617 is about 600.1449807056.

The spelling of 216156617 in words is "two hundred sixteen million, one hundred fifty-six thousand, six hundred seventeen".