722266561 has 2 divisors, whose sum is σ = 722266562. Its totient is φ = 722266560.

The previous prime is 722266553. The next prime is 722266577. The reversal of 722266561 is 165662227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388838961 + 333427600 = 19719^2 + 18260^2 .

It is an emirp because it is prime and its reverse (165662227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722266561 - 2³ = 722266553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722266561.

It is not a weakly prime, because it can be changed into another prime (722266261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361133280 + 361133281.

It is an arithmetic number, because the mean of its divisors is an integer number (361133281).

Almost surely, 2^722266561 is an apocalyptic number.

It is an amenable number.

722266561 is a deficient number, since it is larger than the sum of its proper divisors (1).

722266561 is an equidigital number, since it uses as much as digits as its factorization.

722266561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 722266561 is about 26875.0174139478. The cubic root of 722266561 is about 897.2204620287.

It can be divided in two parts, 72226 and 6561, that added together give a palindrome (78787).

The spelling of 722266561 in words is "seven hundred twenty-two million, two hundred sixty-six thousand, five hundred sixty-one".