216156204266 has 16 divisors (see below), whose sum is σ = 325245244104. Its totient is φ = 107741297664.

The previous prime is 216156204247. The next prime is 216156204283. The reversal of 216156204266 is 662402651612.

It can be written as a sum of positive squares in 4 ways, for example, as 140759282041 + 75396922225 = 375179^2 + 274585^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2551460 + ... + 2634816.

Almost surely, 2^216156204266 is an apocalyptic number.

216156204266 is a deficient number, since it is larger than the sum of its proper divisors (109089039838).

216156204266 is a wasteful number, since it uses less digits than its factorization.

216156204266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87385.

The product of its (nonzero) digits is 207360, while the sum is 41.

Adding to 216156204266 its reverse (662402651612), we get a palindrome (878558855878).

The spelling of 216156204266 in words is "two hundred sixteen billion, one hundred fifty-six million, two hundred four thousand, two hundred sixty-six".