44140471681 has 4 divisors (see below), whose sum is σ = 44140951764. Its totient is φ = 44139991600.

The previous prime is 44140471679. The next prime is 44140471723. The reversal of 44140471681 is 18617404144.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 41160294400 + 2980177281 = 202880^2 + 54591^2 .

It is a cyclic number.

It is not a de Polignac number, because 44140471681 - 2¹ = 44140471679 is a prime.

It is a super-2 number, since 2×44140471681² (a number of 22 digits) contains 22 as substring.

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 Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44140471601) 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, 54130 + ... + 302011.

It is an arithmetic number, because the mean of its divisors is an integer number (11035237941).

Almost surely, 2^44140471681 is an apocalyptic number.

It is an amenable number.

44140471681 is a deficient number, since it is larger than the sum of its proper divisors (480083).

44140471681 is a wasteful number, since it uses less digits than its factorization.

44140471681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480082.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 44140471681 in words is "forty-four billion, one hundred forty million, four hundred seventy-one thousand, six hundred eighty-one".