216245505 has 16 divisors (see below), whose sum is σ = 395420544. Its totient is φ = 98855040.

The previous prime is 216245467. The next prime is 216245509. The reversal of 216245505 is 505542612.

It is not a de Polignac number, because 216245505 - 2⁹ = 216244993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216245509) 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, 1029636 + ... + 1029845.

It is an arithmetic number, because the mean of its divisors is an integer number (24713784).

Almost surely, 2^216245505 is an apocalyptic number.

It is an amenable number.

216245505 is a deficient number, since it is larger than the sum of its proper divisors (179175039).

216245505 is a wasteful number, since it uses less digits than its factorization.

216245505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059496.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 216245505 is about 14705.2883344734. The cubic root of 216245505 is about 600.2272333752.

The spelling of 216245505 in words is "two hundred sixteen million, two hundred forty-five thousand, five hundred five".