40204441643 has 4 divisors (see below), whose sum is σ = 40213418328. Its totient is φ = 40195464960.

The previous prime is 40204441637. The next prime is 40204441687. The reversal of 40204441643 is 34614440204.

It is a happy number.

40204441643 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 40204441643 - 2¹² = 40204437547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40204441843) 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, 4481621 + ... + 4490582.

It is an arithmetic number, because the mean of its divisors is an integer number (10053354582).

Almost surely, 2^40204441643 is an apocalyptic number.

40204441643 is a deficient number, since it is larger than the sum of its proper divisors (8976685).

40204441643 is an equidigital number, since it uses as much as digits as its factorization.

40204441643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8976684.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 40204441643 its reverse (34614440204), we get a palindrome (74818881847).

The spelling of 40204441643 in words is "forty billion, two hundred four million, four hundred forty-one thousand, six hundred forty-three".