423145420561 has 4 divisors (see below), whose sum is σ = 423151052800. Its totient is φ = 423139788324.

The previous prime is 423145420493. The next prime is 423145420591. The reversal of 423145420561 is 165024541324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 423145420561 - 2¹³ = 423145412369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 423145420561.

It is not an unprimeable number, because it can be changed into a prime (423145420591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2701881 + ... + 2854198.

It is an arithmetic number, because the mean of its divisors is an integer number (105787763200).

Almost surely, 2^423145420561 is an apocalyptic number.

It is an amenable number.

423145420561 is a deficient number, since it is larger than the sum of its proper divisors (5632239).

423145420561 is an equidigital number, since it uses as much as digits as its factorization.

423145420561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632238.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 423145420561 its reverse (165024541324), we get a palindrome (588169961885).

The spelling of 423145420561 in words is "four hundred twenty-three billion, one hundred forty-five million, four hundred twenty thousand, five hundred sixty-one".