423899905545 has 12 divisors (see below), whose sum is σ = 734759836356. Its totient is φ = 226079949600.

The previous prime is 423899905501. The next prime is 423899905547. The reversal of 423899905545 is 545509998324.

423899905545 is a `hidden beast` number, since 4 + 2 + 3 + 89 + 9 + 9 + 0 + 5 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 233207863056 + 190692042489 = 482916^2 + 436683^2 .

It is not a de Polignac number, because 423899905545 - 2¹⁰ = 423899904521 is a prime.

It is a super-2 number, since 2×423899905545² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (423899905547) 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 11 ways as a sum of consecutive naturals, for example, 4709998906 + ... + 4709998995.

It is an arithmetic number, because the mean of its divisors is an integer number (61229986363).

Almost surely, 2^423899905545 is an apocalyptic number.

423899905545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

423899905545 is a deficient number, since it is larger than the sum of its proper divisors (310859930811).

423899905545 is a wasteful number, since it uses less digits than its factorization.

423899905545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9419997912 (or 9419997909 counting only the distinct ones).

The product of its (nonzero) digits is 69984000, while the sum is 63.

The spelling of 423899905545 in words is "four hundred twenty-three billion, eight hundred ninety-nine million, nine hundred five thousand, five hundred forty-five".