216770577 has 4 divisors (see below), whose sum is σ = 289027440. Its totient is φ = 144513716.

The previous prime is 216770539. The next prime is 216770633. The reversal of 216770577 is 775077612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216770577 - 2⁶ = 216770513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216770537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36128427 + ... + 36128432.

It is an arithmetic number, because the mean of its divisors is an integer number (72256860).

Almost surely, 2^216770577 is an apocalyptic number.

It is an amenable number.

216770577 is a deficient number, since it is larger than the sum of its proper divisors (72256863).

216770577 is an equidigital number, since it uses as much as digits as its factorization.

216770577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72256862.

The product of its (nonzero) digits is 144060, while the sum is 42.

The square root of 216770577 is about 14723.1306793087. The cubic root of 216770577 is about 600.7126504360.

The spelling of 216770577 in words is "two hundred sixteen million, seven hundred seventy thousand, five hundred seventy-seven".