943398705661 has 2 divisors, whose sum is σ = 943398705662. Its totient is φ = 943398705660.

The previous prime is 943398705589. The next prime is 943398705677. The reversal of 943398705661 is 166507893349.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718408808100 + 224989897561 = 847590^2 + 474331^2 .

It is a cyclic number.

It is not a de Polignac number, because 943398705661 - 2⁹ = 943398705149 is a prime.

It is a super-2 number, since 2×943398705661² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 943398705661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (943398705061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 471699352830 + 471699352831.

It is an arithmetic number, because the mean of its divisors is an integer number (471699352831).

Almost surely, 2^943398705661 is an apocalyptic number.

It is an amenable number.

943398705661 is a deficient number, since it is larger than the sum of its proper divisors (1).

943398705661 is an equidigital number, since it uses as much as digits as its factorization.

943398705661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 943398705661 in words is "nine hundred forty-three billion, three hundred ninety-eight million, seven hundred five thousand, six hundred sixty-one".