7720216897 has 4 divisors (see below), whose sum is σ = 7722033840. Its totient is φ = 7718399956.

The previous prime is 7720216873. The next prime is 7720216921. The reversal of 7720216897 is 7986120277.

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 an interprime number because it is at equal distance from previous prime (7720216873) and next prime (7720216921).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7720216897 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7720216897.

It is not an unprimeable number, because it can be changed into a prime (7720216807) 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, 902083 + ... + 910600.

It is an arithmetic number, because the mean of its divisors is an integer number (1930508460).

Almost surely, 2^7720216897 is an apocalyptic number.

It is an amenable number.

7720216897 is a deficient number, since it is larger than the sum of its proper divisors (1816943).

7720216897 is a wasteful number, since it uses less digits than its factorization.

7720216897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816942.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 7720216897 is about 87864.7648207175. The cubic root of 7720216897 is about 1976.4075334846.

The spelling of 7720216897 in words is "seven billion, seven hundred twenty million, two hundred sixteen thousand, eight hundred ninety-seven".