43999999999999 has 4 divisors (see below), whose sum is σ = 44002463209936. Its totient is φ = 43997536790064.

The previous prime is 43999999999981. The next prime is 44000000000009. The reversal of 43999999999999 is 99999999999934.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43999999999999 is a prime.

It is a super-9 number, since 9×43999999999999⁹ (a number of 124 digits) contains 999999999 as substring.

It is a Duffinian number.

43999999999999 is a modest number, since divided by 9999999 gives 4399999 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 43999999999892 and 43999999999901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43999999999909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231578174 + ... + 1231613899.

It is an arithmetic number, because the mean of its divisors is an integer number (11000615802484).

Almost surely, 2^{43999999999999} is an apocalyptic number.

43999999999999 is a deficient number, since it is larger than the sum of its proper divisors (2463209937).

43999999999999 is a wasteful number, since it uses less digits than its factorization.

43999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463209936.

The product of its digits is 3389154437772, while the sum is 115.

The spelling of 43999999999999 in words is "forty-three trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".