216645262 has 4 divisors (see below), whose sum is σ = 324967896. Its totient is φ = 108322630.

The previous prime is 216645251. The next prime is 216645269. The reversal of 216645262 is 262546612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216645269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54161314 + ... + 54161317.

It is an arithmetic number, because the mean of its divisors is an integer number (81241974).

Almost surely, 2^216645262 is an apocalyptic number.

216645262 is a deficient number, since it is larger than the sum of its proper divisors (108322634).

216645262 is a wasteful number, since it uses less digits than its factorization.

216645262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108322633.

The product of its digits is 34560, while the sum is 34.

The square root of 216645262 is about 14718.8743455469. The cubic root of 216645262 is about 600.5968708599.

The spelling of 216645262 in words is "two hundred sixteen million, six hundred forty-five thousand, two hundred sixty-two".