44640493591 has 4 divisors (see below), whose sum is σ = 44677913472. Its totient is φ = 44603073712.

The previous prime is 44640493589. The next prime is 44640493619. The reversal of 44640493591 is 19539404644.

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 44640493591 - 2¹ = 44640493589 is a prime.

It is a super-2 number, since 2×44640493591² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44640493691) 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 3 ways as a sum of consecutive naturals, for example, 18708151 + ... + 18710536.

It is an arithmetic number, because the mean of its divisors is an integer number (11169478368).

Almost surely, 2^44640493591 is an apocalyptic number.

44640493591 is a deficient number, since it is larger than the sum of its proper divisors (37419881).

44640493591 is a wasteful number, since it uses less digits than its factorization.

44640493591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37419880.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 44640493591 in words is "forty-four billion, six hundred forty million, four hundred ninety-three thousand, five hundred ninety-one".