44291561681 has 2 divisors, whose sum is σ = 44291561682. Its totient is φ = 44291561680.

The previous prime is 44291561669. The next prime is 44291561707. The reversal of 44291561681 is 18616519244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42553088656 + 1738473025 = 206284^2 + 41695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44291561681 is a prime.

It is a super-2 number, since 2×44291561681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44291561981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22145780840 + 22145780841.

It is an arithmetic number, because the mean of its divisors is an integer number (22145780841).

Almost surely, 2^44291561681 is an apocalyptic number.

It is an amenable number.

44291561681 is a deficient number, since it is larger than the sum of its proper divisors (1).

44291561681 is an equidigital number, since it uses as much as digits as its factorization.

44291561681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 47.

The spelling of 44291561681 in words is "forty-four billion, two hundred ninety-one million, five hundred sixty-one thousand, six hundred eighty-one".