216740555 has 8 divisors (see below), whose sum is σ = 266432544. Its totient is φ = 169163200.

The previous prime is 216740527. The next prime is 216740567. The reversal of 216740555 is 555047612.

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

It is not a de Polignac number, because 216740555 - 2⁸ = 216740299 is a prime.

It is a Duffinian 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, 528431 + ... + 528840.

It is an arithmetic number, because the mean of its divisors is an integer number (33304068).

Almost surely, 2^216740555 is an apocalyptic number.

216740555 is a deficient number, since it is larger than the sum of its proper divisors (49691989).

216740555 is a wasteful number, since it uses less digits than its factorization.

216740555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057317.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 216740555 is about 14722.1110918238. Note that the first 3 decimals coincide. The cubic root of 216740555 is about 600.6849169246.

The spelling of 216740555 in words is "two hundred sixteen million, seven hundred forty thousand, five hundred fifty-five".