423440977849 has 2 divisors, whose sum is σ = 423440977850. Its totient is φ = 423440977848.

The previous prime is 423440977847. The next prime is 423440977871. The reversal of 423440977849 is 948779044324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404184420025 + 19256557824 = 635755^2 + 138768^2 .

It is a cyclic number.

It is not a de Polignac number, because 423440977849 - 2¹ = 423440977847 is a prime.

It is a super-3 number, since 3×423440977849³ (a number of 36 digits) contains 333 as substring.

Together with 423440977847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (423440977847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211720488924 + 211720488925.

It is an arithmetic number, because the mean of its divisors is an integer number (211720488925).

Almost surely, 2^423440977849 is an apocalyptic number.

It is an amenable number.

423440977849 is a deficient number, since it is larger than the sum of its proper divisors (1).

423440977849 is an equidigital number, since it uses as much as digits as its factorization.

423440977849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48771072, while the sum is 61.

The spelling of 423440977849 in words is "four hundred twenty-three billion, four hundred forty million, nine hundred seventy-seven thousand, eight hundred forty-nine".