4144424637781 has 2 divisors, whose sum is σ = 4144424637782. Its totient is φ = 4144424637780.

The previous prime is 4144424637751. The next prime is 4144424637797. The reversal of 4144424637781 is 1877364244414.

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., 3945820715281 + 198603922500 = 1986409^2 + 445650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4144424637781 is a prime.

It is a super-2 number, since 2×4144424637781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4144424637751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2072212318890 + 2072212318891.

It is an arithmetic number, because the mean of its divisors is an integer number (2072212318891).

Almost surely, 2^{4144424637781} is an apocalyptic number.

It is an amenable number.

4144424637781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4144424637781 is an equidigital number, since it uses as much as digits as its factorization.

4144424637781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14450688, while the sum is 55.

The spelling of 4144424637781 in words is "four trillion, one hundred forty-four billion, four hundred twenty-four million, six hundred thirty-seven thousand, seven hundred eighty-one".