40643441256 has 32 divisors (see below), whose sum is σ = 110845749600. Its totient is φ = 12316194240.

The previous prime is 40643441239. The next prime is 40643441257. The reversal of 40643441256 is 65214434604.

It is not an unprimeable number, because it can be changed into a prime (40643441257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76975951 + ... + 76976478.

It is an arithmetic number, because the mean of its divisors is an integer number (3463929675).

Almost surely, 2^40643441256 is an apocalyptic number.

It is an amenable number.

40643441256 is an abundant number, since it is smaller than the sum of its proper divisors (70202308344).

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

40643441256 is a wasteful number, since it uses less digits than its factorization.

40643441256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153952449 (or 153952445 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 40643441256 in words is "forty billion, six hundred forty-three million, four hundred forty-one thousand, two hundred fifty-six".