43994810105856 has 150 divisors (see below), whose sum is σ = 131437277208930. Its totient is φ = 14664936259584.

The previous prime is 43994810105737. The next prime is 43994810105929. The reversal of 43994810105856 is 65850101849934.

43994810105856 is a `hidden beast` number, since 4 + 3 + 9 + 9 + 48 + 1 + 0 + 1 + 0 + 585 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29691165081600 + 14303645024256 = 5448960^2 + 3782016^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43994810105793 and 43994810105802.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 15248391 + ... + 17902598.

Almost surely, 2^{43994810105856} is an apocalyptic number.

It is an amenable number.

43994810105856 is an abundant number, since it is smaller than the sum of its proper divisors (87442467103074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43994810105856 is an frugal number, since it uses more digits than its factorization.

43994810105856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33151029 (or 33150994 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 43994810105856 in words is "forty-three trillion, nine hundred ninety-four billion, eight hundred ten million, one hundred five thousand, eight hundred fifty-six".