722857943581 has 2 divisors, whose sum is σ = 722857943582. Its totient is φ = 722857943580.

The previous prime is 722857943579. The next prime is 722857943597. The reversal of 722857943581 is 185349758227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627753551481 + 95104392100 = 792309^2 + 308390^2 .

It is a cyclic number.

It is not a de Polignac number, because 722857943581 - 2¹ = 722857943579 is a prime.

It is a super-2 number, since 2×722857943581² (a number of 25 digits) contains 22 as substring.

Together with 722857943579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722857943501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361428971790 + 361428971791.

It is an arithmetic number, because the mean of its divisors is an integer number (361428971791).

Almost surely, 2^722857943581 is an apocalyptic number.

It is an amenable number.

722857943581 is a deficient number, since it is larger than the sum of its proper divisors (1).

722857943581 is an equidigital number, since it uses as much as digits as its factorization.

722857943581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33868800, while the sum is 61.

The spelling of 722857943581 in words is "seven hundred twenty-two billion, eight hundred fifty-seven million, nine hundred forty-three thousand, five hundred eighty-one".