1720216855 has 8 divisors (see below), whose sum is σ = 2359154592. Its totient is φ = 1179577248.

The previous prime is 1720216843. The next prime is 1720216903. The reversal of 1720216855 is 5586120271.

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 1720216855 - 2⁷ = 1720216727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24574492 + ... + 24574561.

It is an arithmetic number, because the mean of its divisors is an integer number (294894324).

Almost surely, 2^1720216855 is an apocalyptic number.

1720216855 is a deficient number, since it is larger than the sum of its proper divisors (638937737).

1720216855 is an equidigital number, since it uses as much as digits as its factorization.

1720216855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49149065.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 1720216855 is about 41475.4970434352. The cubic root of 1720216855 is about 1198.1956343117.

The spelling of 1720216855 in words is "one billion, seven hundred twenty million, two hundred sixteen thousand, eight hundred fifty-five".