216615465 has 40 divisors (see below), whose sum is σ = 423612288. Its totient is φ = 105023520.

The previous prime is 216615457. The next prime is 216615473. The reversal of 216615465 is 564516612.

It is an interprime number because it is at equal distance from previous prime (216615457) and next prime (216615473).

It is not a de Polignac number, because 216615465 - 2³ = 216615457 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19857 + ... + 28766.

Almost surely, 2^216615465 is an apocalyptic number.

It is an amenable number.

216615465 is a deficient number, since it is larger than the sum of its proper divisors (206996823).

216615465 is a wasteful number, since it uses less digits than its factorization.

216615465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48651 (or 48642 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 216615465 is about 14717.8621069774. The cubic root of 216615465 is about 600.5693345927.

The spelling of 216615465 in words is "two hundred sixteen million, six hundred fifteen thousand, four hundred sixty-five".