423390709561 has 2 divisors, whose sum is σ = 423390709562. Its totient is φ = 423390709560.

The previous prime is 423390709559. The next prime is 423390709579. The reversal of 423390709561 is 165907093324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373160935161 + 50229774400 = 610869^2 + 224120^2 .

It is a cyclic number.

It is not a de Polignac number, because 423390709561 - 2¹ = 423390709559 is a prime.

Together with 423390709559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (423390706561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211695354780 + 211695354781.

It is an arithmetic number, because the mean of its divisors is an integer number (211695354781).

Almost surely, 2^423390709561 is an apocalyptic number.

It is an amenable number.

423390709561 is a deficient number, since it is larger than the sum of its proper divisors (1).

423390709561 is an equidigital number, since it uses as much as digits as its factorization.

423390709561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 423390709561 in words is "four hundred twenty-three billion, three hundred ninety million, seven hundred nine thousand, five hundred sixty-one".