43413447661 has 2 divisors, whose sum is σ = 43413447662. Its totient is φ = 43413447660.

The previous prime is 43413447659. The next prime is 43413447733. The reversal of 43413447661 is 16674431434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35145000900 + 8268446761 = 187470^2 + 90931^2 .

It is a cyclic number.

It is not a de Polignac number, because 43413447661 - 2¹ = 43413447659 is a prime.

Together with 43413447659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43413447601) 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, 21706723830 + 21706723831.

It is an arithmetic number, because the mean of its divisors is an integer number (21706723831).

Almost surely, 2^43413447661 is an apocalyptic number.

It is an amenable number.

43413447661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43413447661 is an equidigital number, since it uses as much as digits as its factorization.

43413447661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 43.

The spelling of 43413447661 in words is "forty-three billion, four hundred thirteen million, four hundred forty-seven thousand, six hundred sixty-one".