216720695 has 4 divisors (see below), whose sum is σ = 260064840. Its totient is φ = 173376552.

The previous prime is 216720677. The next prime is 216720701. The reversal of 216720695 is 596027612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216720695 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 21672065 + ... + 21672074.

It is an arithmetic number, because the mean of its divisors is an integer number (65016210).

Almost surely, 2^216720695 is an apocalyptic number.

216720695 is a deficient number, since it is larger than the sum of its proper divisors (43344145).

216720695 is an equidigital number, since it uses as much as digits as its factorization.

216720695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43344144.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 216720695 is about 14721.4365807145. The cubic root of 216720695 is about 600.6665693864. Note that the first 3 decimals are identical.

The spelling of 216720695 in words is "two hundred sixteen million, seven hundred twenty thousand, six hundred ninety-five".