722742631817 has 2 divisors, whose sum is σ = 722742631818. Its totient is φ = 722742631816.

The previous prime is 722742631813. The next prime is 722742631859. The reversal of 722742631817 is 718136247227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432416717056 + 290325914761 = 657584^2 + 538819^2 .

It is a cyclic number.

It is not a de Polignac number, because 722742631817 - 2² = 722742631813 is a prime.

It is not a weakly prime, because it can be changed into another prime (722742631813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361371315908 + 361371315909.

It is an arithmetic number, because the mean of its divisors is an integer number (361371315909).

Almost surely, 2^722742631817 is an apocalyptic number.

It is an amenable number.

722742631817 is a deficient number, since it is larger than the sum of its proper divisors (1).

722742631817 is an equidigital number, since it uses as much as digits as its factorization.

722742631817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 50.

The spelling of 722742631817 in words is "seven hundred twenty-two billion, seven hundred forty-two million, six hundred thirty-one thousand, eight hundred seventeen".