40564643943 has 16 divisors (see below), whose sum is σ = 55175770112. Its totient is φ = 26501580000.

The previous prime is 40564643941. The next prime is 40564643947. The reversal of 40564643943 is 34934646504.

It is not a de Polignac number, because 40564643943 - 2¹ = 40564643941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40564643892 and 40564643901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40564643941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359383 + ... + 458568.

It is an arithmetic number, because the mean of its divisors is an integer number (3448485632).

Almost surely, 2^40564643943 is an apocalyptic number.

40564643943 is a deficient number, since it is larger than the sum of its proper divisors (14611126169).

40564643943 is a wasteful number, since it uses less digits than its factorization.

40564643943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818286.

The product of its (nonzero) digits is 3732480, while the sum is 48.

The spelling of 40564643943 in words is "forty billion, five hundred sixty-four million, six hundred forty-three thousand, nine hundred forty-three".