216631653 has 16 divisors (see below), whose sum is σ = 341489280. Its totient is φ = 119520576.

The previous prime is 216631643. The next prime is 216631669. The reversal of 216631653 is 356136612.

216631653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216631653 - 2⁴ = 216631637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216631643) 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, 177250 + ... + 178467.

It is an arithmetic number, because the mean of its divisors is an integer number (21343080).

Almost surely, 2^216631653 is an apocalyptic number.

It is an amenable number.

216631653 is a deficient number, since it is larger than the sum of its proper divisors (124857627).

216631653 is a wasteful number, since it uses less digits than its factorization.

216631653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355756.

The product of its digits is 19440, while the sum is 33.

The square root of 216631653 is about 14718.4120407060. The cubic root of 216631653 is about 600.5842947037.

The spelling of 216631653 in words is "two hundred sixteen million, six hundred thirty-one thousand, six hundred fifty-three".