216617955 has 16 divisors (see below), whose sum is σ = 364830720. Its totient is φ = 109448928.

The previous prime is 216617939. The next prime is 216617957. The reversal of 216617955 is 559716612.

It is not a de Polignac number, because 216617955 - 2⁴ = 216617939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216617957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379747 + ... + 380316.

It is an arithmetic number, because the mean of its divisors is an integer number (22801920).

Almost surely, 2^216617955 is an apocalyptic number.

216617955 is a deficient number, since it is larger than the sum of its proper divisors (148212765).

216617955 is a wasteful number, since it uses less digits than its factorization.

216617955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760090.

The product of its digits is 113400, while the sum is 42.

The square root of 216617955 is about 14717.9466978244. The cubic root of 216617955 is about 600.5716357702.

The spelling of 216617955 in words is "two hundred sixteen million, six hundred seventeen thousand, nine hundred fifty-five".