441777831661 has 2 divisors, whose sum is σ = 441777831662. Its totient is φ = 441777831660.

The previous prime is 441777831647. The next prime is 441777831679. The reversal of 441777831661 is 166138777144.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222388639561 + 219389192100 = 471581^2 + 468390^2 .

It is a cyclic number.

It is not a de Polignac number, because 441777831661 - 2¹³ = 441777823469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (441777831601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220888915830 + 220888915831.

It is an arithmetic number, because the mean of its divisors is an integer number (220888915831).

Almost surely, 2^441777831661 is an apocalyptic number.

It is an amenable number.

441777831661 is a deficient number, since it is larger than the sum of its proper divisors (1).

441777831661 is an equidigital number, since it uses as much as digits as its factorization.

441777831661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 55.

The spelling of 441777831661 in words is "four hundred forty-one billion, seven hundred seventy-seven million, eight hundred thirty-one thousand, six hundred sixty-one".