216061605 has 12 divisors (see below), whose sum is σ = 374506860. Its totient is φ = 115232832.

The previous prime is 216061589. The next prime is 216061613. The reversal of 216061605 is 506160612.

It is a happy number.

216061605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43480836 + 172580769 = 6594^2 + 13137^2 .

It is not a de Polignac number, because 216061605 - 2⁴ = 216061589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2400640 + ... + 2400729.

It is an arithmetic number, because the mean of its divisors is an integer number (31208905).

Almost surely, 2^216061605 is an apocalyptic number.

It is an amenable number.

216061605 is a deficient number, since it is larger than the sum of its proper divisors (158445255).

216061605 is a wasteful number, since it uses less digits than its factorization.

216061605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801380 (or 4801377 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 216061605 is about 14699.0341519435. The cubic root of 216061605 is about 600.0570362446.

The spelling of 216061605 in words is "two hundred sixteen million, sixty-one thousand, six hundred five".