216556045 has 8 divisors (see below), whose sum is σ = 260282880. Its totient is φ = 172967760.

The previous prime is 216556031. The next prime is 216556061. The reversal of 216556045 is 540655612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216556045 - 2⁹ = 216555533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216556045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31165 + ... + 37474.

It is an arithmetic number, because the mean of its divisors is an integer number (32535360).

Almost surely, 2^216556045 is an apocalyptic number.

It is an amenable number.

216556045 is a deficient number, since it is larger than the sum of its proper divisors (43726835).

216556045 is an equidigital number, since it uses as much as digits as its factorization.

216556045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69275.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 216556045 is about 14715.8433329524. The cubic root of 216556045 is about 600.5144153169.

The spelling of 216556045 in words is "two hundred sixteen million, five hundred fifty-six thousand, forty-five".