423324155581 has 2 divisors, whose sum is σ = 423324155582. Its totient is φ = 423324155580.

The previous prime is 423324155531. The next prime is 423324155603. The reversal of 423324155581 is 185551423324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260568390681 + 162755764900 = 510459^2 + 403430^2 .

It is a cyclic number.

It is not a de Polignac number, because 423324155581 - 2⁹ = 423324155069 is a prime.

It is a super-2 number, since 2×423324155581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423324155531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211662077790 + 211662077791.

It is an arithmetic number, because the mean of its divisors is an integer number (211662077791).

Almost surely, 2^423324155581 is an apocalyptic number.

It is an amenable number.

423324155581 is a deficient number, since it is larger than the sum of its proper divisors (1).

423324155581 is an equidigital number, since it uses as much as digits as its factorization.

423324155581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576000, while the sum is 43.

The spelling of 423324155581 in words is "four hundred twenty-three billion, three hundred twenty-four million, one hundred fifty-five thousand, five hundred eighty-one".