44644290721 has 2 divisors, whose sum is σ = 44644290722. Its totient is φ = 44644290720.

The previous prime is 44644290701. The next prime is 44644290731. The reversal of 44644290721 is 12709244644.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31590085696 + 13054205025 = 177736^2 + 114255^2 .

It is a cyclic number.

It is not a de Polignac number, because 44644290721 - 2⁵ = 44644290689 is a prime.

It is a super-2 number, since 2×44644290721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44644290701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22322145360 + 22322145361.

It is an arithmetic number, because the mean of its divisors is an integer number (22322145361).

Almost surely, 2^44644290721 is an apocalyptic number.

It is an amenable number.

44644290721 is a deficient number, since it is larger than the sum of its proper divisors (1).

44644290721 is an equidigital number, since it uses as much as digits as its factorization.

44644290721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 44644290721 in words is "forty-four billion, six hundred forty-four million, two hundred ninety thousand, seven hundred twenty-one".