440245621661 has 2 divisors, whose sum is σ = 440245621662. Its totient is φ = 440245621660.

The previous prime is 440245621657. The next prime is 440245621681. The reversal of 440245621661 is 166126542044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434129443225 + 6116178436 = 658885^2 + 78206^2 .

It is a cyclic number.

It is not a de Polignac number, because 440245621661 - 2² = 440245621657 is a prime.

It is a super-3 number, since 3×440245621661³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440245621681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220122810830 + 220122810831.

It is an arithmetic number, because the mean of its divisors is an integer number (220122810831).

Almost surely, 2^440245621661 is an apocalyptic number.

It is an amenable number.

440245621661 is a deficient number, since it is larger than the sum of its proper divisors (1).

440245621661 is an equidigital number, since it uses as much as digits as its factorization.

440245621661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 440245621661 in words is "four hundred forty billion, two hundred forty-five million, six hundred twenty-one thousand, six hundred sixty-one".