43401663643 has 4 divisors (see below), whose sum is σ = 46740253168. Its totient is φ = 40063074120.

The previous prime is 43401663623. The next prime is 43401663673. The reversal of 43401663643 is 34636610434.

43401663643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 43401663643 - 2⁵ = 43401663611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43401663596 and 43401663605.

It is not an unprimeable number, because it can be changed into a prime (43401663623) 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, 1669294743 + ... + 1669294768.

It is an arithmetic number, because the mean of its divisors is an integer number (11685063292).

Almost surely, 2^43401663643 is an apocalyptic number.

43401663643 is a deficient number, since it is larger than the sum of its proper divisors (3338589525).

43401663643 is a wasteful number, since it uses less digits than its factorization.

43401663643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338589524.

The product of its (nonzero) digits is 373248, while the sum is 40.

The spelling of 43401663643 in words is "forty-three billion, four hundred one million, six hundred sixty-three thousand, six hundred forty-three".