216770523 has 4 divisors (see below), whose sum is σ = 289027368. Its totient is φ = 144513680.

The previous prime is 216770513. The next prime is 216770537. The reversal of 216770523 is 325077612.

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

It is a cyclic number.

It is not a de Polignac number, because 216770523 - 2¹² = 216766427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216770503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36128418 + ... + 36128423.

It is an arithmetic number, because the mean of its divisors is an integer number (72256842).

Almost surely, 2^216770523 is an apocalyptic number.

216770523 is a deficient number, since it is larger than the sum of its proper divisors (72256845).

216770523 is an equidigital number, since it uses as much as digits as its factorization.

216770523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72256844.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 216770523 is about 14723.1288454594. The cubic root of 216770523 is about 600.7126005546.

The spelling of 216770523 in words is "two hundred sixteen million, seven hundred seventy thousand, five hundred twenty-three".