216552405 has 16 divisors (see below), whose sum is σ = 364720320. Its totient is φ = 109415808.

The previous prime is 216552373. The next prime is 216552419. The reversal of 216552405 is 504255612.

It is not a de Polignac number, because 216552405 - 2⁵ = 216552373 is a prime.

It is a super-2 number, since 2×216552405² = 93789888222568050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379632 + ... + 380201.

It is an arithmetic number, because the mean of its divisors is an integer number (22795020).

Almost surely, 2^216552405 is an apocalyptic number.

It is an amenable number.

216552405 is a deficient number, since it is larger than the sum of its proper divisors (148167915).

216552405 is a wasteful number, since it uses less digits than its factorization.

216552405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759860.

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

The square root of 216552405 is about 14715.7196562044. The cubic root of 216552405 is about 600.5110506995.

The spelling of 216552405 in words is "two hundred sixteen million, five hundred fifty-two thousand, four hundred five".