44495261721 has 9 divisors (see below), whose sum is σ = 64271847679. Its totient is φ = 29663085936.

The previous prime is 44495261689. The next prime is 44495261743. The reversal of 44495261721 is 12716259444.

The square root of 44495261721 is 210939.

It is a perfect power (a square), and thus also a powerful number.

44495261721 is a `hidden beast` number, since 4 + 4 + 4 + 9 + 5 + 2 + 617 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 44493996096 = 1125^2 + 210936^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 44495261721 - 2⁵ = 44495261689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44425261721) 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 8 ways as a sum of consecutive naturals, for example, 597661 + ... + 667973.

Almost surely, 2^44495261721 is an apocalyptic number.

44495261721 is the 210939-th square number.

44495261721 is the 105470-th centered octagonal number.

It is an amenable number.

44495261721 is a deficient number, since it is larger than the sum of its proper divisors (19776585958).

44495261721 is an frugal number, since it uses more digits than its factorization.

44495261721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140632 (or 70316 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 44495261721 in words is "forty-four billion, four hundred ninety-five million, two hundred sixty-one thousand, seven hundred twenty-one".