216254661 has 16 divisors (see below), whose sum is σ = 336543744. Its totient is φ = 120944304.

The previous prime is 216254659. The next prime is 216254683. The reversal of 216254661 is 166452612.

216254661 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 216254661 - 2¹ = 216254659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216254641) 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, 108565 + ... + 110538.

It is an arithmetic number, because the mean of its divisors is an integer number (21033984).

Almost surely, 2^216254661 is an apocalyptic number.

216254661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

216254661 is a deficient number, since it is larger than the sum of its proper divisors (120289083).

216254661 is a wasteful number, since it uses less digits than its factorization.

216254661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219160.

The product of its digits is 17280, while the sum is 33.

The square root of 216254661 is about 14705.5996477532. The cubic root of 216254661 is about 600.2357046157.

The spelling of 216254661 in words is "two hundred sixteen million, two hundred fifty-four thousand, six hundred sixty-one".