44661365981 has 2 divisors, whose sum is σ = 44661365982. Its totient is φ = 44661365980.

The previous prime is 44661365923. The next prime is 44661366007. The reversal of 44661365981 is 18956316644.

44661365981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40294138756 + 4367227225 = 200734^2 + 66085^2 .

It is a cyclic number.

It is not a de Polignac number, because 44661365981 - 2²⁶ = 44594257117 is a prime.

It is a super-2 number, since 2×44661365981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44661362981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22330682990 + 22330682991.

It is an arithmetic number, because the mean of its divisors is an integer number (22330682991).

Almost surely, 2^44661365981 is an apocalyptic number.

It is an amenable number.

44661365981 is a deficient number, since it is larger than the sum of its proper divisors (1).

44661365981 is an equidigital number, since it uses as much as digits as its factorization.

44661365981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The spelling of 44661365981 in words is "forty-four billion, six hundred sixty-one million, three hundred sixty-five thousand, nine hundred eighty-one".