7320216857 has 2 divisors, whose sum is σ = 7320216858. Its totient is φ = 7320216856.

The previous prime is 7320216853. The next prime is 7320216889. The reversal of 7320216857 is 7586120237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7310079001 + 10137856 = 85499^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 7320216857 - 2² = 7320216853 is a prime.

It is not a weakly prime, because it can be changed into another prime (7320216853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3660108428 + 3660108429.

It is an arithmetic number, because the mean of its divisors is an integer number (3660108429).

Almost surely, 2^7320216857 is an apocalyptic number.

It is an amenable number.

7320216857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7320216857 is an equidigital number, since it uses as much as digits as its factorization.

7320216857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 7320216857 is about 85558.2658601727. The cubic root of 7320216857 is about 1941.6665504622. Note that the first 3 decimals are identical.

The spelling of 7320216857 in words is "seven billion, three hundred twenty million, two hundred sixteen thousand, eight hundred fifty-seven".