43123240065 has 32 divisors (see below), whose sum is σ = 69491874816. Its totient is φ = 22834457280.

The previous prime is 43123240057. The next prime is 43123240093. The reversal of 43123240065 is 56004232134.

It is not a de Polignac number, because 43123240065 - 2³ = 43123240057 is a prime.

It is a super-2 number, since 2×43123240065² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2512242 + ... + 2529348.

It is an arithmetic number, because the mean of its divisors is an integer number (2171621088).

Almost surely, 2^43123240065 is an apocalyptic number.

It is an amenable number.

43123240065 is a deficient number, since it is larger than the sum of its proper divisors (26368634751).

43123240065 is a wasteful number, since it uses less digits than its factorization.

43123240065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18309.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 43123240065 its reverse (56004232134), we get a palindrome (99127472199).

The spelling of 43123240065 in words is "forty-three billion, one hundred twenty-three million, two hundred forty thousand, sixty-five".