40445501638 has 4 divisors (see below), whose sum is σ = 60668252460. Its totient is φ = 20222750818.

The previous prime is 40445501497. The next prime is 40445501653. The reversal of 40445501638 is 83610554404.

It is a happy number.

40445501638 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 Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40445501638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111375408 + ... + 10111375411.

It is an arithmetic number, because the mean of its divisors is an integer number (15167063115).

Almost surely, 2^40445501638 is an apocalyptic number.

40445501638 is a deficient number, since it is larger than the sum of its proper divisors (20222750822).

40445501638 is a wasteful number, since it uses less digits than its factorization.

40445501638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222750821.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 40445501638 in words is "forty billion, four hundred forty-five million, five hundred one thousand, six hundred thirty-eight".