423656577389 has 2 divisors, whose sum is σ = 423656577390. Its totient is φ = 423656577388.

The previous prime is 423656577371. The next prime is 423656577391. The reversal of 423656577389 is 983775656324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299811002500 + 123845574889 = 547550^2 + 351917^2 .

It is a cyclic number.

It is not a de Polignac number, because 423656577389 - 2⁸ = 423656577133 is a prime.

Together with 423656577391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423656577319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211828288694 + 211828288695.

It is an arithmetic number, because the mean of its divisors is an integer number (211828288695).

Almost surely, 2^423656577389 is an apocalyptic number.

It is an amenable number.

423656577389 is a deficient number, since it is larger than the sum of its proper divisors (1).

423656577389 is an equidigital number, since it uses as much as digits as its factorization.

423656577389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 228614400, while the sum is 65.

The spelling of 423656577389 in words is "four hundred twenty-three billion, six hundred fifty-six million, five hundred seventy-seven thousand, three hundred eighty-nine".