216615673 has 8 divisors (see below), whose sum is σ = 218717928. Its totient is φ = 214523904.

The previous prime is 216615661. The next prime is 216615677. The reversal of 216615673 is 376516612.

It can be written as a sum of positive squares in 4 ways, for example, as 4272489 + 212343184 = 2067^2 + 14572^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 216615673 - 2¹³ = 216607481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216615677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42561 + ... + 47377.

It is an arithmetic number, because the mean of its divisors is an integer number (27339741).

Almost surely, 2^216615673 is an apocalyptic number.

It is an amenable number.

216615673 is a deficient number, since it is larger than the sum of its proper divisors (2102255).

216615673 is a wasteful number, since it uses less digits than its factorization.

216615673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243.

The product of its digits is 45360, while the sum is 37.

The square root of 216615673 is about 14717.8691732193. The cubic root of 216615673 is about 600.5695268202.

The spelling of 216615673 in words is "two hundred sixteen million, six hundred fifteen thousand, six hundred seventy-three".